United States · Multi-region weather view
Walla Walla Valley
Sign in to followAn inland valley spanning southeastern Washington and northeastern Oregon.
Summers are warm and dry, while cold winters and spring frost remain recurring risks.
Climate comparisons use the 1991–2020 combined regional record · updated through Aug 20, 2026.
Current conditions
Observations through Aug 30, 2026 · 21:30 UTC
Temperature23.0°C
Dew Point3.0°C
Relative Humidity27%
24h Rainfall0.0 mmmodeled IFS total through Aug 29
NWS station average · 1 station
Temperature, dew point, humidity, and wind are averaged using the same locations and weights as the historical record. The current temperature uses 100% of the configured regional weight.
- KALW — Walla Walla Regional Airport · 100% regional weight
NOAA National Weather Service observations. Station readings are point measurements and may not represent every vineyard elevation or exposure.
Vintage explorer
Mean temperature16.1°C
Temperature anomaly+1.1°Cvs 1991-2020
Growing degree days1542base 10°C
Hot days1≥ 35°C
What stood out in 2025
Warm weather can speed ripening and leave grapes with less acidity. A freeze after budbreak can damage new growth and reduce the crop.
Warmer growing season · High confidence
Mean growing-season temperature was +1.1°C versus the 1991–2020 baseline.
Warm weather can speed ripening and leave grapes with less acidity.
Spring freeze recorded · Moderate confidence
The regional record had 3 spring day(s) at or below -2°C.
A freeze after budbreak can damage new growth and reduce the crop.
How unusual was 2025?
The ranking compares vintages that meet the data-coverage threshold and use the same source, regional rules, and 1991-2020 baseline.
Growing-season temperature
3rd warmest of 35 vintages Warmer than 32 of 34 other vintages 16.1°CGrowing-season rainfall
9th driest of 35 vintages Drier than 26 of 34 other vintages 209.5 mmHeat accumulation
4th highest of 35 vintages Higher than 31 of 34 other vintages 1543 GDDHot days
4th fewest of 35 vintages Fewer than 30 of 34 other vintages 1 days2025 month by month
Compared with 1991–2020
Follow heat accumulation, rainfall, frost exposure, and the region’s growing and harvest windows in calendar order.
Frost watch
Growing season
Harvest window
-
1–31 Frost watchGrowing seasonHeat accumulation
2025 23 GDDTypical 6 GDDRainfall
2025 84.8 mmTypical 67.8 mm- 2025 freezing days
- 5
- Typical
- 10.9
Close to the typical monthly pattern.
-
1–30 Frost watchGrowing seasonHeat accumulation
2025 28 GDDTypical 30 GDDRainfall
2025 28.0 mmTypical 54.3 mm- 2025 freezing days
- 7
- Typical
- 4.4
More freezing days than the typical month.
-
1–31 Frost watchGrowing seasonHeat accumulation
2025 121 GDDTypical 119 GDDRainfall
2025 25.7 mmTypical 52.1 mm- 2025 freezing days
- 0
- Typical
- 0.6
Drier than the typical month.
-
1–30 Growing seasonHeat accumulation
2025 262 GDDTypical 209 GDDRainfall
2025 2.5 mmTypical 33.3 mmHeat accumulation ran ahead of the typical month.
-
1–31 Growing seasonHeat accumulation
2025 397 GDDTypical 363 GDDRainfall
2025 5.8 mmTypical 8.9 mmClose to the typical monthly pattern.
-
1–31 Growing seasonHarvest windowHeat accumulation
2025 384 GDDTypical 347 GDDRainfall
2025 13.7 mmTypical 11.3 mmClose to the typical monthly pattern.
-
1–30 Growing seasonHarvest windowHeat accumulation
2025 290 GDDTypical 200 GDDRainfall
2025 13.3 mmTypical 20.3 mmHeat accumulation ran ahead of the typical month.
-
1–31 Growing seasonHarvest windowHeat accumulation
2025 39 GDDTypical 47 GDDRainfall
2025 54.7 mmTypical 49.6 mmClose to the typical monthly pattern.
View milestone calendar data as a table
| Month | 2025 GDD | Typical GDD | 2025 rainfall | Typical rainfall | 2025 freezing days | Typical freezing days |
|---|---|---|---|---|---|---|
| March 2025 | 23 GDD | 6 GDD | 84.8 mm | 67.8 mm | 5 | 10.9 |
| April 2025 | 28 GDD | 30 GDD | 28.0 mm | 54.3 mm | 7 | 4.4 |
| May 2025 | 121 GDD | 119 GDD | 25.7 mm | 52.1 mm | 0 | 0.6 |
| June 2025 | 262 GDD | 209 GDD | 2.5 mm | 33.3 mm | Outside frost window | Outside frost window |
| July 2025 | 397 GDD | 363 GDD | 5.8 mm | 8.9 mm | Outside frost window | Outside frost window |
| August 2025 | 384 GDD | 347 GDD | 13.7 mm | 11.3 mm | Outside frost window | Outside frost window |
| September 2025 | 290 GDD | 200 GDD | 13.3 mm | 20.3 mm | Outside frost window | Outside frost window |
| October 2025 | 39 GDD | 47 GDD | 54.7 mm | 49.6 mm | Outside frost window | Outside frost window |
Calendar data and method
Monthly values are weighted across every configured regional sample using stored Google ARCO ERA5 daily reanalysis. “Typical” is the mean monthly total across 30 baseline seasons. GDD is counted only inside the configured growing window; freezing days are counted only inside the frost-watch window; rainfall covers every displayed calendar day.
Selected-vintage coverage is 100%. Source rows were last retrieved Aug 20, 2026.
Replay the 2025 growing season
231 daily regional observations
Move through the season to follow temperature, rainfall, accumulated heat, and recorded weather events day by day.
Mean temperature
Daily rainfall
Season GDD
Season rainfall
No detected event on this date.
Replay data and method
Daily values are weighted across every configured regional sample using stored Google ARCO ERA5 reanalysis. Coverage is 100%. Source rows were last retrieved Aug 20, 2026.
Closest weather matches
These years had the most similar growing-season and harvest weather.
Closest match
1994
Most alike in Spring frost exposure and Growing-season precipitation.
- Spring frost exposure
- more frost-exposure days: 2 days
- Growing-season precipitation
- more rain: 23.1 mm
Largest difference: Hot-day count — more hot days
View 1994 →Second closest
2014
Most alike in Spring frost exposure and Growing-season mean temperature.
- Spring frost exposure
- fewer frost-exposure days: 1 day
- Growing-season mean temperature
- cooler: 0.1°C
Largest difference: Hot-day count — more hot days
View 2014 →Third closest
2018
Most alike in Growing-season precipitation and Spring frost exposure.
- Growing-season precipitation
- more rain: 4.0 mm
- Spring frost exposure
- more frost-exposure days: 3 days
Largest difference: Hot-day count — more hot days
View 2018 →
How similar years are calculated
Method analog-v1-2026-07 standardizes six weather measures across 34 complete ARCO ERA5 comparison years, then measures the distance between them. The calculation runs when the page is requested.
Measures used: Growing-season mean temperature (20%); Growing degree days (15%); Hot-day count (15%); Growing-season precipitation (20%); Harvest precipitation (20%); Spring frost exposure (10%).
Calculated distances: 1994 0.728; 2014 0.730; 2018 0.932.
View historical chart data as a table
| Year | Temperature anomaly | Rainfall anomaly | Hot days |
|---|---|---|---|
| 1991 | -0.7°C | +8 mm | 2 |
| 1992 | +1.0°C | -12 mm | 13 |
| 1993 | -0.5°C | +62 mm | 0 |
| 1994 | +0.7°C | -36 mm | 6 |
| 1995 | -0.8°C | +63 mm | 0 |
| 1996 | -0.8°C | +18 mm | 9 |
| 1997 | -0.3°C | +46 mm | 1 |
| 1998 | +0.6°C | +1 mm | 15 |
| 1999 | -0.9°C | -71 mm | 2 |
| 2000 | -0.4°C | +29 mm | 2 |
| 2001 | -0.1°C | -8 mm | 5 |
| 2002 | -0.6°C | -72 mm | 7 |
| 2003 | +1.0°C | -40 mm | 12 |
| 2004 | +0.8°C | +22 mm | 10 |
| 2005 | +0.1°C | +19 mm | 8 |
| 2006 | +0.3°C | -35 mm | 11 |
| 2007 | -0.8°C | -62 mm | 8 |
| 2008 | -1.6°C | -61 mm | 5 |
| 2009 | -0.1°C | +39 mm | 6 |
| 2010 | -0.7°C | +80 mm | 3 |
| 2011 | -1.0°C | +7 mm | 0 |
| 2012 | +0.1°C | +115 mm | 10 |
| 2013 | +0.2°C | -14 mm | 6 |
| 2014 | +1.0°C | -36 mm | 8 |
| 2015 | +1.7°C | -75 mm | 17 |
| 2016 | +0.6°C | +34 mm | 3 |
| 2017 | +0.7°C | +34 mm | 15 |
| 2018 | +0.4°C | -55 mm | 9 |
| 2019 | -0.1°C | +25 mm | 3 |
| 2020 | +0.4°C | -23 mm | 9 |
| 2021 | +1.2°C | -114 mm | 18 |
| 2022 | +0.7°C | +120 mm | 14 |
| 2023 | +0.8°C | -60 mm | 10 |
| 2024 | +0.7°C | -74 mm | 11 |
| 2025 | +1.1°C | -59 mm | 1 |
| 2026 | +1.3°C | -134 mm | 3 |
winter
1.2°C
-0.2°C vs baseline
251 mm rain · +35 mm
spring
10.3°C
+0.8°C vs baseline
138 mm rain · -36 mm
summer
21.3°C
+1.4°C vs baseline
21 mm rain · -32 mm
harvest
16.4°C
+1.5°C vs baseline
77 mm rain · +1 mm
Weather events
Periods that crossed one of the published regional thresholds, shown in date order.
Spring frost exposure
- Minimum temperature
- -2.6°C
- Duration
- 3 days
- Severe-freeze days
- 2 days
The regional model recorded freezing temperatures during spring.
Spring frost exposure
- Minimum temperature
- -2.1°C
- Duration
- 1 day
- Severe-freeze days
- 1 day
The regional model recorded freezing temperatures during spring.
Spring frost exposure
- Minimum temperature
- -0.5°C
- Duration
- 1 day
- Severe-freeze days
- 0 days
The regional model recorded freezing temperatures during spring.
Spring frost exposure
- Minimum temperature
- -0.2°C
- Duration
- 2 days
- Severe-freeze days
- 0 days
The regional model recorded freezing temperatures during spring.
Spring frost exposure
- Minimum temperature
- -1.7°C
- Duration
- 2 days
- Severe-freeze days
- 0 days
The regional model recorded freezing temperatures during spring.
Spring frost exposure
- Minimum temperature
- -0.9°C
- Duration
- 1 day
- Severe-freeze days
- 0 days
The regional model recorded freezing temperatures during spring.
Spring frost exposure
- Minimum temperature
- -1.1°C
- Duration
- 2 days
- Severe-freeze days
- 0 days
The regional model recorded freezing temperatures during spring.
Dry spell
- Duration
- 61 days
- Total rain
- 4.2 mm
- Daily cutoff
- 1.0 mm/day
Dry spell
- Duration
- 14 days
- Total rain
- 1.7 mm
- Daily cutoff
- 1.0 mm/day
Dry spell
- Duration
- 14 days
- Total rain
- 1.6 mm
- Daily cutoff
- 1.0 mm/day
How events are detected
Weather & Vines combined regional series; method event-timeline-v2-2026-07, rules walla-walla-valley-catalog-v1-2026-07. Source last updated Aug 1, 2026, calculated Aug 29, 2026. Each configured point must have at least 95.0% coverage.
1991–present
Climate change
Measured regional trends are shown separately from model projections. The observed record ends at the latest complete growing season shared by every published region.
Observed record
Historical trends, 1991–2025
Growing degree days changed +74.8 GDD per decade. The 95% interval is +45.6 to +104.0 GDD per decade, based on 35 eligible vintages.
Weighted median: 70% SSP2-4.5 · 15% SSP1-2.6 · 15% SSP3-7.0
Shaded central 80% model range using the same weights.
How it is measured: Across the March 15–October 31 growing season, each day's mean temperature above 10°C adds to the total; cooler days add zero.
Scroll horizontally to inspect the full timeline.
View annual growing degree days data
| Vintage | Growing degree days | Change from 1991–2020 |
|---|---|---|
| 1991 | 1213 GDD | -106 GDD |
| 1992 | 1455 GDD | +135 GDD |
| 1993 | 1138 GDD | -181 GDD |
| 1994 | 1414 GDD | +95 GDD |
| 1995 | 1138 GDD | -182 GDD |
| 1996 | 1201 GDD | -119 GDD |
| 1997 | 1246 GDD | -73 GDD |
| 1998 | 1453 GDD | +133 GDD |
| 1999 | 1168 GDD | -152 GDD |
| 2000 | 1205 GDD | -114 GDD |
| 2001 | 1324 GDD | +4 GDD |
| 2002 | 1258 GDD | -61 GDD |
| 2003 | 1530 GDD | +210 GDD |
| 2004 | 1414 GDD | +94 GDD |
| 2005 | 1308 GDD | -12 GDD |
| 2006 | 1388 GDD | +68 GDD |
| 2007 | 1159 GDD | -161 GDD |
| 2008 | 1126 GDD | -194 GDD |
| 2009 | 1371 GDD | +52 GDD |
| 2010 | 1167 GDD | -153 GDD |
| 2011 | 1138 GDD | -182 GDD |
| 2012 | 1346 GDD | +26 GDD |
| 2013 | 1386 GDD | +66 GDD |
| 2014 | 1484 GDD | +165 GDD |
| 2015 | 1610 GDD | +291 GDD |
| 2016 | 1352 GDD | +32 GDD |
| 2017 | 1458 GDD | +139 GDD |
| 2018 | 1375 GDD | +56 GDD |
| 2019 | 1330 GDD | +10 GDD |
| 2020 | 1433 GDD | +114 GDD |
| 2021 | 1568 GDD | +248 GDD |
| 2022 | 1499 GDD | +179 GDD |
| 2023 | 1560 GDD | +240 GDD |
| 2024 | 1433 GDD | +114 GDD |
| 2025 | 1543 GDD | +223 GDD |
- Growing-season mean temperature
- +0.34 °C per decade 95% interval +0.17 to +0.52
- Growing degree days
- +74.80 GDD per decade 95% interval +45.59 to +104.02
- Growing-season precipitation
- -10.67 mm per decade 95% interval -22.30 to +0.95
- Hot days
- +1.55 days per decade 95% interval +0.31 to +2.79
- Spring frost days
- +1.05 days per decade 95% interval -1.06 to +3.16
- Longest dry spell
- +5.63 days per decade 95% interval +2.11 to +9.15
Last Updated August 20, 2026
Model ensemble
Projected climate through 2075
Temperature changes are relative to each model’s 1991–2020 baseline. The table combines all three pathways, weighted 70% to SSP2-4.5 and 15% each to SSP1-2.6 and SSP3-7.0.
Scroll horizontally to compare all columns.
| Period | Weighted median | Weighted central 80% | Models per pathway |
|---|---|---|---|
| 2021-2040 | +1.0°C | +0.6 to +1.6°C | 25 |
| 2041-2060 | +1.7°C | +1.2 to +2.8°C | 25 |
| 2061-2075 | +2.1°C | +1.6 to +3.4°C | 25 |
How pathways are combined
For each period and percentile, Weather & Vines takes 70% of the SSP2-4.5 value, 15% of the SSP1-2.6 value, and 15% of the SSP3-7.0 value. Each pathway contains the same 25 models. The weights are an editorial view of the current trajectory, not scenario probabilities.
Last Updated June 29, 2025
Typical year · 1991–2020
When to visit
This calendar describes typical regional weather under the selected climate baseline. It is not a forecast for a future trip, and it does not account for crowds, lodging, events, or vineyard access.
Deterministic IFS forecast
Next ten days
Scroll horizontally to see all forecast dates.
| Date | Sun | Mon | Tue | Wed | Thu | Fri | Sat | Sun | Mon | Tue |
|---|---|---|---|---|---|---|---|---|---|---|
| High | 23°C | 31°C | 28°C | 22°C | 18°C | 20°C | 19°C | 22°C | 25°C | 24°C |
| Low | 12°C | 12°C | 18°C | 14°C | 14°C | 13°C | 12°C | 12°C | 12°C | 13°C |
| Rain | 0.0 mm | 0.0 mm | 0.0 mm | 1.4 mm | 9.7 mm | 0.5 mm | 1.5 mm | 0.0 mm | 0.0 mm | 0.0 mm |
Across the typical year: Late July has the warmest median afternoon high (30.9°C); Late December has the coolest (3.5°C). Wet days are most frequent in Late November (54%) and least frequent in Late July (6%). Ties are resolved by calendar order.
Afternoon highOvernight lowMiddle 50%
Scroll horizontally to inspect all 24 half-month periods.
Scroll horizontally to inspect all 24 half-month periods.
View all 24 periods as a table
Scroll horizontally to view all columns.
| Period | Afternoon high, median (middle 50%) | Overnight low, median (middle 50%) | Wet-day frequency | Period rain, median (middle 50%) |
|---|---|---|---|---|
| Jan 1–15 | 4.4°C (1.0–7.4°C) | -1.6°C (-5.0–1.2°C) | 48% | 29.7 mm (21.8–48.2 mm) |
| Jan 16–31 | 4.8°C (2.0–7.9°C) | -1.1°C (-3.6–1.2°C) | 47% | 40.4 mm (22.8–54.3 mm) |
| Feb 1–15 | 6.8°C (4.4–9.2°C) | -0.8°C (-3.8–1.4°C) | 42% | 27.4 mm (17.2–39.6 mm) |
| Feb 16–29 | 7.6°C (5.2–10.0°C) | -1.1°C (-3.4–1.8°C) | 48% | 30.5 mm (19.1–38.4 mm) |
| Mar 1–15 | 9.9°C (7.2–13.3°C) | 0.6°C (-1.8–2.8°C) | 47% | 27.1 mm (18.3–48.8 mm) |
| Mar 16–31 | 11.6°C (9.2–14.1°C) | 1.4°C (-0.3–3.6°C) | 49% | 32.9 mm (24.1–40.2 mm) |
| Apr 1–15 | 12.9°C (10.6–15.8°C) | 2.7°C (0.5–5.1°C) | 48% | 26.1 mm (21.9–35.9 mm) |
| Apr 16–30 | 15.4°C (13.2–19.0°C) | 4.1°C (2.0–6.4°C) | 35% | 18.4 mm (9.6–32.7 mm) |
| May 1–15 | 18.1°C (14.8–22.6°C) | 6.0°C (3.3–8.3°C) | 33% | 21.1 mm (12.0–30.9 mm) |
| May 16–31 | 20.5°C (17.2–23.7°C) | 8.2°C (6.0–10.4°C) | 35% | 24.5 mm (11.9–44.8 mm) |
| Jun 1–15 | 22.0°C (18.6–25.2°C) | 9.2°C (7.3–11.2°C) | 28% | 22.1 mm (8.5–29.4 mm) |
| Jun 16–30 | 25.1°C (21.8–28.7°C) | 10.7°C (8.6–13.0°C) | 18% | 8.9 mm (3.5–17.7 mm) |
| Jul 1–15 | 28.8°C (25.7–32.1°C) | 13.0°C (10.9–15.2°C) | 8% | 2.8 mm (0.6–6.2 mm) |
| Jul 16–31 | 30.9°C (28.0–33.8°C) | 14.3°C (12.1–16.3°C) | 6% | 1.2 mm (0.4–7.7 mm) |
| Aug 1–15 | 30.5°C (27.4–33.0°C) | 14.1°C (11.9–16.1°C) | 7% | 1.6 mm (0.5–6.7 mm) |
| Aug 16–31 | 28.3°C (25.3–30.9°C) | 12.7°C (10.6–14.8°C) | 8% | 3.5 mm (1.0–7.5 mm) |
| Sep 1–15 | 25.6°C (21.6–29.0°C) | 10.5°C (8.0–12.8°C) | 12% | 4.3 mm (0.3–15.0 mm) |
| Sep 16–30 | 22.5°C (18.6–26.0°C) | 8.7°C (6.5–10.5°C) | 19% | 10.0 mm (2.4–15.7 mm) |
| Oct 1–15 | 17.0°C (14.5–21.0°C) | 5.7°C (3.1–7.9°C) | 24% | 13.9 mm (9.6–26.4 mm) |
| Oct 16–31 | 14.2°C (11.6–17.0°C) | 3.5°C (0.9–6.1°C) | 37% | 32.7 mm (17.7–38.6 mm) |
| Nov 1–15 | 9.8°C (7.3–12.4°C) | 1.4°C (-1.5–4.0°C) | 44% | 29.7 mm (17.8–40.6 mm) |
| Nov 16–30 | 7.1°C (3.9–9.7°C) | -0.2°C (-3.2–2.4°C) | 54% | 42.1 mm (26.6–61.5 mm) |
| Dec 1–15 | 4.2°C (1.5–7.1°C) | -1.8°C (-4.5–0.8°C) | 52% | 42.8 mm (25.6–50.7 mm) |
| Dec 16–31 | 3.5°C (1.2–6.3°C) | -2.6°C (-4.8–-0.2°C) | 45% | 42.9 mm (24.5–60.1 mm) |
Each year contributes to temperature or rain separately when at least 90% of that period’s days are present. A value is shown only when at least 80% of the baseline years qualify. February 29 is included in late February.
Historical climatology Last Updated August 20, 2026
Season to date
Growing season heat and rainfall
Mar 15–Aug 29, 2026
Growing degree days1106.2base 10°C
Growing-season rainfall134.9 mmweighted regional total
2026 season1991–2020 average
2026 season1991–2020 average
View growing-season accumulation data
| Date | Season GDD | 1991–2020 average GDD | Season rainfall | 1991–2020 average rainfall |
|---|---|---|---|---|
| 2026-03-15 | 0.0 | 0.3 | 0.2 mm | 3.5 mm |
| 2026-03-16 | 0.0 | 0.4 | 0.5 mm | 5.6 mm |
| 2026-03-17 | 3.7 | 0.5 | 0.5 mm | 7.5 mm |
| 2026-03-18 | 7.5 | 0.7 | 0.5 mm | 9.1 mm |
| 2026-03-19 | 14.7 | 0.9 | 0.5 mm | 10.2 mm |
| 2026-03-20 | 20.2 | 1.1 | 0.6 mm | 12.3 mm |
| 2026-03-21 | 20.2 | 1.1 | 8.3 mm | 14.9 mm |
| 2026-03-22 | 20.2 | 1.3 | 8.3 mm | 17.7 mm |
| 2026-03-23 | 20.2 | 1.4 | 8.3 mm | 19.9 mm |
| 2026-03-24 | 22.3 | 1.7 | 13.4 mm | 22.7 mm |
| 2026-03-25 | 22.3 | 1.8 | 14.6 mm | 25.5 mm |
| 2026-03-26 | 22.3 | 1.9 | 14.6 mm | 27.6 mm |
| 2026-03-27 | 22.3 | 2.1 | 14.6 mm | 30.3 mm |
| 2026-03-28 | 22.3 | 2.2 | 14.6 mm | 33.0 mm |
| 2026-03-29 | 22.3 | 2.5 | 15.0 mm | 35.8 mm |
| 2026-03-30 | 22.3 | 2.9 | 15.1 mm | 37.3 mm |
| 2026-03-31 | 22.3 | 3.4 | 15.9 mm | 39.0 mm |
| 2026-04-01 | 22.3 | 3.9 | 26.6 mm | 40.7 mm |
| 2026-04-02 | 22.3 | 4.4 | 28.7 mm | 42.5 mm |
| 2026-04-03 | 22.3 | 5.1 | 28.7 mm | 44.4 mm |
| 2026-04-04 | 22.3 | 5.4 | 28.7 mm | 46.4 mm |
| 2026-04-05 | 25.5 | 5.7 | 28.7 mm | 48.4 mm |
| 2026-04-06 | 29.3 | 6.4 | 28.7 mm | 50.3 mm |
| 2026-04-07 | 32.6 | 7.3 | 28.7 mm | 52.4 mm |
| 2026-04-08 | 32.6 | 8.2 | 28.7 mm | 54.9 mm |
| 2026-04-09 | 33.0 | 8.9 | 28.7 mm | 57.0 mm |
| 2026-04-10 | 33.8 | 9.5 | 31.4 mm | 58.7 mm |
| 2026-04-11 | 36.1 | 10.0 | 37.1 mm | 60.7 mm |
| 2026-04-12 | 36.1 | 10.6 | 52.4 mm | 62.7 mm |
| 2026-04-13 | 36.1 | 11.4 | 59.4 mm | 65.1 mm |
| 2026-04-14 | 36.1 | 11.5 | 60.2 mm | 67.4 mm |
| 2026-04-15 | 36.1 | 12.0 | 68.3 mm | 69.6 mm |
| 2026-04-16 | 36.1 | 12.8 | 70.7 mm | 71.5 mm |
| 2026-04-17 | 36.1 | 13.9 | 70.7 mm | 73.0 mm |
| 2026-04-18 | 36.1 | 15.0 | 70.7 mm | 74.2 mm |
| 2026-04-19 | 39.7 | 16.3 | 70.7 mm | 75.6 mm |
| 2026-04-20 | 44.1 | 18.1 | 70.7 mm | 77.0 mm |
| 2026-04-21 | 48.3 | 20.0 | 75.5 mm | 77.9 mm |
| 2026-04-22 | 48.3 | 21.6 | 98.7 mm | 79.2 mm |
| 2026-04-23 | 48.3 | 23.0 | 100.1 mm | 81.6 mm |
| 2026-04-24 | 48.3 | 24.0 | 100.1 mm | 83.6 mm |
| 2026-04-25 | 48.3 | 25.4 | 100.4 mm | 85.0 mm |
| 2026-04-26 | 48.3 | 27.0 | 100.4 mm | 86.4 mm |
| 2026-04-27 | 48.3 | 29.1 | 100.5 mm | 88.5 mm |
| 2026-04-28 | 48.8 | 30.6 | 100.5 mm | 90.1 mm |
| 2026-04-29 | 50.4 | 31.9 | 100.8 mm | 91.6 mm |
| 2026-04-30 | 53.3 | 33.3 | 100.8 mm | 93.3 mm |
| 2026-05-01 | 59.8 | 35.0 | 100.8 mm | 94.4 mm |
| 2026-05-02 | 68.4 | 37.3 | 101.3 mm | 95.8 mm |
| 2026-05-03 | 76.9 | 39.4 | 101.3 mm | 97.4 mm |
| 2026-05-04 | 85.2 | 42.1 | 101.3 mm | 99.1 mm |
| 2026-05-05 | 92.8 | 44.9 | 101.3 mm | 100.4 mm |
| 2026-05-06 | 100.5 | 47.4 | 101.3 mm | 101.9 mm |
| 2026-05-07 | 106.8 | 50.1 | 101.3 mm | 102.7 mm |
| 2026-05-08 | 111.8 | 53.2 | 101.3 mm | 104.4 mm |
| 2026-05-09 | 116.1 | 55.8 | 101.3 mm | 105.7 mm |
| 2026-05-10 | 121.9 | 58.7 | 101.3 mm | 106.8 mm |
| 2026-05-11 | 126.4 | 62.4 | 101.3 mm | 108.5 mm |
| 2026-05-12 | 134.1 | 66.2 | 101.3 mm | 109.8 mm |
| 2026-05-13 | 138.5 | 69.9 | 104.6 mm | 111.3 mm |
| 2026-05-14 | 139.8 | 74.2 | 105.1 mm | 113.1 mm |
| 2026-05-15 | 140.3 | 78.5 | 105.6 mm | 115.5 mm |
| 2026-05-16 | 140.3 | 83.1 | 107.5 mm | 117.8 mm |
| 2026-05-17 | 140.3 | 87.6 | 108.6 mm | 121.0 mm |
| 2026-05-18 | 141.1 | 91.8 | 108.8 mm | 123.6 mm |
| 2026-05-19 | 144.0 | 96.0 | 108.9 mm | 126.1 mm |
| 2026-05-20 | 147.7 | 99.3 | 108.9 mm | 129.4 mm |
| 2026-05-21 | 152.2 | 102.5 | 108.9 mm | 131.7 mm |
| 2026-05-22 | 157.8 | 106.2 | 108.9 mm | 133.4 mm |
| 2026-05-23 | 165.7 | 110.7 | 108.9 mm | 134.2 mm |
| 2026-05-24 | 174.0 | 115.9 | 108.9 mm | 135.1 mm |
| 2026-05-25 | 182.5 | 120.6 | 109.1 mm | 137.0 mm |
| 2026-05-26 | 184.0 | 125.1 | 112.3 mm | 138.7 mm |
| 2026-05-27 | 189.6 | 129.7 | 112.3 mm | 140.0 mm |
| 2026-05-28 | 199.1 | 134.6 | 114.3 mm | 141.4 mm |
| 2026-05-29 | 205.6 | 140.1 | 114.4 mm | 142.5 mm |
| 2026-05-30 | 209.0 | 146.1 | 114.4 mm | 143.6 mm |
| 2026-05-31 | 212.1 | 152.4 | 114.4 mm | 145.4 mm |
| 2026-06-01 | 217.2 | 158.9 | 114.4 mm | 146.2 mm |
| 2026-06-02 | 223.3 | 165.2 | 114.4 mm | 148.2 mm |
| 2026-06-03 | 231.3 | 171.6 | 114.7 mm | 149.3 mm |
| 2026-06-04 | 238.0 | 178.0 | 114.7 mm | 152.2 mm |
| 2026-06-05 | 242.8 | 183.8 | 114.7 mm | 154.2 mm |
| 2026-06-06 | 246.1 | 189.1 | 114.7 mm | 155.7 mm |
| 2026-06-07 | 248.0 | 194.7 | 114.7 mm | 156.9 mm |
| 2026-06-08 | 252.2 | 200.0 | 116.8 mm | 158.7 mm |
| 2026-06-09 | 257.4 | 205.2 | 124.2 mm | 160.5 mm |
| 2026-06-10 | 261.3 | 210.6 | 125.4 mm | 161.9 mm |
| 2026-06-11 | 265.6 | 216.2 | 125.4 mm | 162.5 mm |
| 2026-06-12 | 272.9 | 221.9 | 125.4 mm | 164.1 mm |
| 2026-06-13 | 280.2 | 227.9 | 125.4 mm | 165.6 mm |
| 2026-06-14 | 289.0 | 233.7 | 125.4 mm | 166.3 mm |
| 2026-06-15 | 299.6 | 239.4 | 125.4 mm | 167.3 mm |
| 2026-06-16 | 313.0 | 245.5 | 125.4 mm | 167.9 mm |
| 2026-06-17 | 322.2 | 252.1 | 125.4 mm | 168.5 mm |
| 2026-06-18 | 331.2 | 258.7 | 125.4 mm | 170.1 mm |
| 2026-06-19 | 342.6 | 265.0 | 125.4 mm | 171.2 mm |
| 2026-06-20 | 355.0 | 272.2 | 125.4 mm | 171.7 mm |
| 2026-06-21 | 364.4 | 280.1 | 125.4 mm | 172.3 mm |
| 2026-06-22 | 374.4 | 288.0 | 125.4 mm | 172.7 mm |
| 2026-06-23 | 385.4 | 296.1 | 125.4 mm | 173.0 mm |
| 2026-06-24 | 396.6 | 304.2 | 125.4 mm | 173.8 mm |
| 2026-06-25 | 407.7 | 312.7 | 125.4 mm | 174.4 mm |
| 2026-06-26 | 414.5 | 321.9 | 127.0 mm | 175.8 mm |
| 2026-06-27 | 419.4 | 331.4 | 127.2 mm | 177.0 mm |
| 2026-06-28 | 424.7 | 341.3 | 127.6 mm | 177.6 mm |
| 2026-06-29 | 431.0 | 351.3 | 131.7 mm | 178.5 mm |
| 2026-06-30 | 437.9 | 361.3 | 131.9 mm | 178.7 mm |
| 2026-07-01 | 443.4 | 371.6 | 131.9 mm | 178.9 mm |
| 2026-07-02 | 449.4 | 381.7 | 131.9 mm | 179.3 mm |
| 2026-07-03 | 458.5 | 391.9 | 131.9 mm | 179.6 mm |
| 2026-07-04 | 469.8 | 401.9 | 131.9 mm | 179.8 mm |
| 2026-07-05 | 479.9 | 412.0 | 131.9 mm | 180.2 mm |
| 2026-07-06 | 489.7 | 422.5 | 132.0 mm | 180.5 mm |
| 2026-07-07 | 503.3 | 433.2 | 132.0 mm | 180.7 mm |
| 2026-07-08 | 517.4 | 444.2 | 132.0 mm | 181.3 mm |
| 2026-07-09 | 529.7 | 455.7 | 132.0 mm | 182.3 mm |
| 2026-07-10 | 542.2 | 467.0 | 132.0 mm | 182.6 mm |
| 2026-07-11 | 554.9 | 478.4 | 132.0 mm | 182.8 mm |
| 2026-07-12 | 565.9 | 490.1 | 132.0 mm | 182.9 mm |
| 2026-07-13 | 578.9 | 501.6 | 132.0 mm | 183.2 mm |
| 2026-07-14 | 594.1 | 513.0 | 132.0 mm | 183.4 mm |
| 2026-07-15 | 611.4 | 524.6 | 132.9 mm | 183.5 mm |
| 2026-07-16 | 627.3 | 536.2 | 133.2 mm | 183.7 mm |
| 2026-07-17 | 639.8 | 548.1 | 133.2 mm | 184.0 mm |
| 2026-07-18 | 652.4 | 559.7 | 133.2 mm | 184.2 mm |
| 2026-07-19 | 663.7 | 571.5 | 133.2 mm | 184.8 mm |
| 2026-07-20 | 675.3 | 583.4 | 133.2 mm | 185.1 mm |
| 2026-07-21 | 688.6 | 595.7 | 133.2 mm | 185.1 mm |
| 2026-07-22 | 705.7 | 608.3 | 133.2 mm | 185.6 mm |
| 2026-07-23 | 722.4 | 620.7 | 133.2 mm | 186.3 mm |
| 2026-07-24 | 738.1 | 633.1 | 133.2 mm | 186.4 mm |
| 2026-07-25 | 751.9 | 645.3 | 133.2 mm | 186.5 mm |
| 2026-07-26 | 762.8 | 658.0 | 133.2 mm | 186.5 mm |
| 2026-07-27 | 773.9 | 671.3 | 133.2 mm | 186.6 mm |
| 2026-07-28 | 785.7 | 685.0 | 133.2 mm | 186.6 mm |
| 2026-07-29 | 796.0 | 698.4 | 133.2 mm | 187.1 mm |
| 2026-07-30 | 807.8 | 711.6 | 133.2 mm | 187.4 mm |
| 2026-07-31 | 820.6 | 724.3 | 133.2 mm | 187.6 mm |
| 2026-08-01 | 833.4 | 737.2 | 133.2 mm | 187.8 mm |
| 2026-08-02 | 840.0 | 749.9 | 133.2 mm | 187.9 mm |
| 2026-08-03 | 846.2 | 762.3 | 133.2 mm | 188.0 mm |
| 2026-08-04 | 854.7 | 775.2 | 133.2 mm | 188.1 mm |
| 2026-08-05 | 866.1 | 788.1 | 133.2 mm | 188.4 mm |
| 2026-08-06 | 880.7 | 800.8 | 133.2 mm | 188.8 mm |
| 2026-08-07 | 896.3 | 812.4 | 133.2 mm | 190.6 mm |
| 2026-08-08 | 910.0 | 823.9 | 133.2 mm | 190.7 mm |
| 2026-08-09 | 922.3 | 835.5 | 133.2 mm | 190.8 mm |
| 2026-08-10 | 934.4 | 847.3 | 133.2 mm | 191.2 mm |
| 2026-08-11 | 945.9 | 858.9 | 133.2 mm | 191.5 mm |
| 2026-08-12 | 957.7 | 870.4 | 133.2 mm | 191.7 mm |
| 2026-08-13 | 968.7 | 882.3 | 133.2 mm | 191.8 mm |
| 2026-08-14 | 980.3 | 894.3 | 133.2 mm | 192.3 mm |
| 2026-08-15 | 992.8 | 906.4 | 134.2 mm | 192.5 mm |
| 2026-08-16 | 1005.5 | 917.8 | 134.7 mm | 193.4 mm |
| 2026-08-17 | 1019.7 | 929.4 | 134.7 mm | 193.5 mm |
| 2026-08-18 | 1033.8 | 941.0 | 134.7 mm | 193.6 mm |
| 2026-08-19 | 1046.8 | 952.6 | 134.7 mm | 193.9 mm |
| 2026-08-20 | 1061.2 | 964.0 | 134.7 mm | 194.5 mm |
| 2026-08-21 | 1078.0 | 974.8 | 134.7 mm | 194.8 mm |
| 2026-08-22 | 1095.5 | 984.8 | 134.9 mm | 196.3 mm |
| 2026-08-23 | 1106.2 | 994.1 | 134.9 mm | 196.7 mm |
Forecast outlook
ECMWF IFS 0.25° via Herbie · run Aug 30, 2026 at 00:00 UTC
10-day totals compared with the 1991–2020 combined regional record
- GDD accumulation
- 79 GDDvs 85 GDD average
- Total rainfall
- 13.2 mmvs 5.6 mm average
No unusually hot or wet period stands out in the short-range forecast.
Sun8/30
23°Cavg 26°C
12°Cavg 12°C
+7 GDD
0.0 mm
Mon8/31
31°Cavg 26°C
12°Cavg 12°C
+12 GDD
0.0 mm
Tue9/1
28°Cavg 26°C
18°Cavg 11°C
+12 GDD
0.0 mm
Wed9/2
22°Cavg 27°C
14°Cavg 11°C
+8 GDD
1.4 mm
Thu9/3
18°Cavg 26°C
14°Cavg 11°C
+6 GDD
9.7 mm
Fri9/4
20°Cavg 26°C
13°Cavg 11°C
+7 GDD
0.5 mm
Sat9/5
19°Cavg 26°C
12°Cavg 11°C
+5 GDD
1.5 mm
Sun9/6
22°Cavg 25°C
12°Cavg 11°C
+6 GDD
0.0 mm
Mon9/7
25°Cavg 25°C
12°Cavg 10°C
+8 GDD
0.0 mm
Tue9/8
24°Cavg 25°C
13°Cavg 10°C
+9 GDD
0.0 mm
Data and methods
Show data sources and model assumptions
Current temperature, dew point, humidity, and wind use geographically weighted NWS station observations. The 24-hour rain total and 10-day outlook use the 00 UTC deterministic ECMWF IFS 0.25° public forecast retrieved directly with Herbie. Historical temperature and rain combine qualifying GHCN-D stations with ERA5 by geographic area; a missing station day uses the nearest ERA5 value for that station's area. Climate comparisons use 1991–2020.
Forecast comparisons use the 1991–2020 combined regional daily record. Daily high and low averages use the matching date; rainfall and GDD sum the same calendar dates as the forecast period.
This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Weather & Vines subsets, converts, and regionally weights the forecast fields. ECMWF data are published under CC BY 4.0. ECMWF accepts no liability for errors, omissions, availability, loss, or damage arising from their use.
Climate projections use NASA NEX-GDDP-CMIP6 v2.0, accessed August 23, 2026, with 25 models. Weather & Vines subsets and aggregates the source fields. Source files and derived projection data are under CC BY-SA 4.0; the full roster and limitations are listed in the climate atlas methods.
The Walla Walla Valley model uses a March 15–October 31 growing season, base 10°C GDD, and an operational hot-day marker of 35°C.
- Washington State Wine Commission: Walla Walla Valley AVA varieties and climate (variety context; no harvest dates)
- WMO climate normals guidance
The historical series uses 1 ERA5 location, 3 temperature stations, and 4 rain stations. Interpretation confidence: high. Geometry confidence: reviewed-approximate. Rules: walla-walla-valley-catalog-v1-2026-07.