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United States · Multi-region weather view

Walla Walla Valley

An 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 31, 2026 · 00:30 UTC

Temperature24.0°C
Dew Point3.0°C
Relative Humidity25%
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

Compare this vintage →

Moderately cooler and slightly wetter than normal.

Mean temperature13.9°C
Temperature anomaly-1.0°Cvs 1991-2020
Growing degree days1137base 10°C
Hot days0≥ 35°C

What stood out in 2011

Cool weather can slow ripening and help grapes retain acidity. A freeze after budbreak can damage new growth and reduce the crop.

Cooler growing season · High confidence

Mean growing-season temperature was -1.0°C versus the 1991–2020 baseline.

Cool weather can slow ripening and help grapes retain acidity.

Spring freeze recorded · Moderate confidence

The regional record had 4 spring day(s) at or below -2°C.

A freeze after budbreak can damage new growth and reduce the crop.

How unusual was 2011?

The ranking compares vintages that meet the data-coverage threshold and use the same source, regional rules, and 1991-2020 baseline.

Growing-season temperature

2nd coolest of 35 vintages Cooler than 33 of 34 other vintages 13.9°C

Growing-season rainfall

16th wettest of 35 vintages Wetter than 19 of 34 other vintages 276.2 mm

Heat accumulation

3rd lowest of 35 vintages Lower than 32 of 34 other vintages 1138 GDD

Hot days

Fewest of 35 vintages Fewer than 32 of 34 other vintages 0 days

2011 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. 1–31
    Frost watchGrowing season

    Heat accumulation

    2011 2 GDD
    Typical 6 GDD

    Rainfall

    2011 100.0 mm
    Typical 67.8 mm
    2011 freezing days
    7
    Typical
    10.9

    Wetter than the typical month.

  2. 1–30
    Frost watchGrowing season

    Heat accumulation

    2011 2 GDD
    Typical 30 GDD

    Rainfall

    2011 62.8 mm
    Typical 54.3 mm
    2011 freezing days
    8
    Typical
    4.4

    More freezing days than the typical month.

  3. 1–31
    Frost watchGrowing season

    Heat accumulation

    2011 44 GDD
    Typical 119 GDD

    Rainfall

    2011 75.3 mm
    Typical 52.1 mm
    2011 freezing days
    1
    Typical
    0.6

    Heat accumulation ran behind the typical month.

  4. 1–30
    Growing season

    Heat accumulation

    2011 149 GDD
    Typical 209 GDD

    Rainfall

    2011 28.2 mm
    Typical 33.3 mm

    Heat accumulation ran behind the typical month.

  5. 1–31
    Growing season

    Heat accumulation

    2011 284 GDD
    Typical 363 GDD

    Rainfall

    2011 4.7 mm
    Typical 8.9 mm

    Heat accumulation ran behind the typical month.

  6. 1–31
    Growing seasonHarvest window

    Heat accumulation

    2011 354 GDD
    Typical 347 GDD

    Rainfall

    2011 0.9 mm
    Typical 11.3 mm

    Drier than the typical month.

  7. 1–30
    Growing seasonHarvest window

    Heat accumulation

    2011 257 GDD
    Typical 200 GDD

    Rainfall

    2011 2.6 mm
    Typical 20.3 mm

    Heat accumulation ran ahead of the typical month.

  8. 1–31
    Growing seasonHarvest window

    Heat accumulation

    2011 45 GDD
    Typical 47 GDD

    Rainfall

    2011 44.3 mm
    Typical 49.6 mm

    Close to the typical monthly pattern.

View milestone calendar data as a table
Month2011 GDDTypical GDD2011 rainfallTypical rainfall2011 freezing daysTypical freezing days
March 2011 2 GDD 6 GDD 100.0 mm 67.8 mm 710.9
April 2011 2 GDD 30 GDD 62.8 mm 54.3 mm 84.4
May 2011 44 GDD 119 GDD 75.3 mm 52.1 mm 10.6
June 2011 149 GDD 209 GDD 28.2 mm 33.3 mm Outside frost windowOutside frost window
July 2011 284 GDD 363 GDD 4.7 mm 8.9 mm Outside frost windowOutside frost window
August 2011 354 GDD 347 GDD 0.9 mm 11.3 mm Outside frost windowOutside frost window
September 2011 257 GDD 200 GDD 2.6 mm 20.3 mm Outside frost windowOutside frost window
October 2011 45 GDD 47 GDD 44.3 mm 49.6 mm Outside frost windowOutside 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 2011 growing season

231 daily regional observations

Move through the season to follow temperature, rainfall, accumulated heat, and recorded weather events day by day.

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.

  1. Closest match

    1991

    Most alike in Growing-season precipitation and Spring frost exposure.

    Growing-season precipitation
    more rain: 0.4 mm
    Spring frost exposure
    more frost-exposure days: 1 day

    Largest difference: Harvest precipitation — less rain

    View 1991 →

  2. Second closest

    1993

    Most alike in Hot-day count and Growing degree days.

    Hot-day count
    the same: 0 days
    Growing degree days
    higher: 0 GDD

    Largest difference: Growing-season precipitation — more rain

    View 1993 →

  3. Third closest

    1995

    Most alike in Hot-day count and Growing degree days.

    Hot-day count
    the same: 0 days
    Growing degree days
    lower: 0 GDD

    Largest difference: Harvest precipitation — more rain

    View 1995 →
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: 1991 0.371; 1993 0.671; 1995 0.847.

Growing-season temperature anomalyCompared with 1991-2020
Temperature anomaly by vintage, 1991 to 2026 A line above zero indicates a warmer growing season than the 1991–2020 baseline. Select a point to inspect that vintage. +1.9°C −1.9°C 1991 2000 2010 2020 2026
Growing-season rainfall anomaly
Rainfall anomaly by vintage, 1991 to 2026 Bars show millimeters above or below the 1991–2020 growing-season baseline. Select a bar to inspect that vintage. +140 mm −140 mm 1991 2000 2010 2020 2026
View historical chart data as a table
YearTemperature anomalyRainfall anomalyHot days
1991-0.7°C+8 mm2
1992+1.0°C-12 mm13
1993-0.5°C+62 mm0
1994+0.7°C-36 mm6
1995-0.8°C+63 mm0
1996-0.8°C+18 mm9
1997-0.3°C+46 mm1
1998+0.6°C+1 mm15
1999-0.9°C-71 mm2
2000-0.4°C+29 mm2
2001-0.1°C-8 mm5
2002-0.6°C-72 mm7
2003+1.0°C-40 mm12
2004+0.8°C+22 mm10
2005+0.1°C+19 mm8
2006+0.3°C-35 mm11
2007-0.8°C-62 mm8
2008-1.6°C-61 mm5
2009-0.1°C+39 mm6
2010-0.7°C+80 mm3
2011-1.0°C+7 mm0
2012+0.1°C+115 mm10
2013+0.2°C-14 mm6
2014+1.0°C-36 mm8
2015+1.7°C-75 mm17
2016+0.6°C+34 mm3
2017+0.7°C+34 mm15
2018+0.4°C-55 mm9
2019-0.1°C+25 mm3
2020+0.4°C-23 mm9
2021+1.2°C-114 mm18
2022+0.7°C+120 mm14
2023+0.8°C-60 mm10
2024+0.7°C-74 mm11
2025+1.1°C-59 mm1
2026+1.3°C-134 mm3

winter

1.3°C

-0.1°C vs baseline

252 mm rain · +37 mm

spring

7.7°C

-1.8°C vs baseline

238 mm rain · +64 mm

summer

18.6°C

-1.4°C vs baseline

33 mm rain · -20 mm

harvest

16.0°C

+1.1°C vs baseline

47 mm rain · -29 mm

Weather events

Periods that crossed one of the published regional thresholds, shown in date order.

  1. Spring frost exposure

    Minimum temperature
    -0.6°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  2. Spring frost exposure

    Minimum temperature
    -1.5°C
    Duration
    3 days
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  3. Spring frost exposure

    Minimum temperature
    -0.5°C
    Duration
    2 days
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  4. Spring frost exposure

    Minimum temperature
    -0.4°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  5. Spring frost exposure

    Minimum temperature
    -2.5°C
    Duration
    3 days
    Severe-freeze days
    2 days

    The regional model recorded freezing temperatures during spring.

  6. Spring frost exposure

    Minimum temperature
    -2.7°C
    Duration
    1 day
    Severe-freeze days
    1 day

    The regional model recorded freezing temperatures during spring.

  7. Spring frost exposure

    Minimum temperature
    -2.0°C
    Duration
    3 days
    Severe-freeze days
    1 day

    The regional model recorded freezing temperatures during spring.

  8. Spring frost exposure

    Minimum temperature
    -0.8°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  9. Spring frost exposure

    Minimum temperature
    -0.1°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  10. Dry spell

    Duration
    23 days
    Total rain
    1.3 mm
    Daily cutoff
    1.0 mm/day

  11. Dry spell

    Duration
    76 days
    Total rain
    4.4 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.

Compare regions

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.

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.

Growing degree days · annual change from the 1991–2020 average1991–2025

Scroll horizontally to inspect the full timeline.

View annual growing degree days data
VintageGrowing degree daysChange from 1991–2020
19911213 GDD-106 GDD
19921455 GDD+135 GDD
19931138 GDD-181 GDD
19941414 GDD+95 GDD
19951138 GDD-182 GDD
19961201 GDD-119 GDD
19971246 GDD-73 GDD
19981453 GDD+133 GDD
19991168 GDD-152 GDD
20001205 GDD-114 GDD
20011324 GDD+4 GDD
20021258 GDD-61 GDD
20031530 GDD+210 GDD
20041414 GDD+94 GDD
20051308 GDD-12 GDD
20061388 GDD+68 GDD
20071159 GDD-161 GDD
20081126 GDD-194 GDD
20091371 GDD+52 GDD
20101167 GDD-153 GDD
20111138 GDD-182 GDD
20121346 GDD+26 GDD
20131386 GDD+66 GDD
20141484 GDD+165 GDD
20151610 GDD+291 GDD
20161352 GDD+32 GDD
20171458 GDD+139 GDD
20181375 GDD+56 GDD
20191330 GDD+10 GDD
20201433 GDD+114 GDD
20211568 GDD+248 GDD
20221499 GDD+179 GDD
20231560 GDD+240 GDD
20241433 GDD+114 GDD
20251543 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.

PeriodWeighted medianWeighted central 80%Models per pathway
2021-2040+1.0°C+0.6 to +1.6°C25
2041-2060+1.7°C+1.2 to +2.8°C25
2061-2075+2.1°C+1.6 to +3.4°C25
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

Compare projection measures across regions

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

Detailed forecast outlook

ECMWF IFS 0.25° via Herbie · model run Aug 30, 2026 at 00:00 UTC · retrieved Aug 30, 2026 at 08:22 UTC

Scroll horizontally to see all forecast dates.

DateSunMonTueWedThuFriSatSunMonTue
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.

Typical afternoon highs and overnight lowsMedians and middle 50% of daily readings

Afternoon highOvernight lowMiddle 50%

Scroll horizontally to inspect all 24 half-month periods.

Typical afternoon highs and overnight lows for Walla Walla Valley Median daily maximum and minimum temperatures for 24 early and late-month periods under the 1991–2020 baseline. Neutral bands show the 25th to 75th percentile. -10°C0°C10°C20°C30°C JanFebMarAprMayJunJulAugSepOctNovDec
How often a day is wetShare of days with at least 1 mm of rain

Scroll horizontally to inspect all 24 half-month periods.

Wet-day frequency through the typical year for Walla Walla Valley The fraction of days receiving at least one millimeter of rain in each early and late-month period under the 1991–2020 baseline. 0%25%50%75%100% JanFebMarAprMayJunJulAugSepOctNovDec
View all 24 periods as a table

Scroll horizontally to view all columns.

Walla Walla Valley typical weather by half-month, 1991–2020
PeriodAfternoon high, median (middle 50%)Overnight low, median (middle 50%)Wet-day frequencyPeriod rain, median (middle 50%)
Jan 1–154.4°C (1.0–7.4°C)-1.6°C (-5.0–1.2°C)48%29.7 mm (21.8–48.2 mm)
Jan 16–314.8°C (2.0–7.9°C)-1.1°C (-3.6–1.2°C)47%40.4 mm (22.8–54.3 mm)
Feb 1–156.8°C (4.4–9.2°C)-0.8°C (-3.8–1.4°C)42%27.4 mm (17.2–39.6 mm)
Feb 16–297.6°C (5.2–10.0°C)-1.1°C (-3.4–1.8°C)48%30.5 mm (19.1–38.4 mm)
Mar 1–159.9°C (7.2–13.3°C)0.6°C (-1.8–2.8°C)47%27.1 mm (18.3–48.8 mm)
Mar 16–3111.6°C (9.2–14.1°C)1.4°C (-0.3–3.6°C)49%32.9 mm (24.1–40.2 mm)
Apr 1–1512.9°C (10.6–15.8°C)2.7°C (0.5–5.1°C)48%26.1 mm (21.9–35.9 mm)
Apr 16–3015.4°C (13.2–19.0°C)4.1°C (2.0–6.4°C)35%18.4 mm (9.6–32.7 mm)
May 1–1518.1°C (14.8–22.6°C)6.0°C (3.3–8.3°C)33%21.1 mm (12.0–30.9 mm)
May 16–3120.5°C (17.2–23.7°C)8.2°C (6.0–10.4°C)35%24.5 mm (11.9–44.8 mm)
Jun 1–1522.0°C (18.6–25.2°C)9.2°C (7.3–11.2°C)28%22.1 mm (8.5–29.4 mm)
Jun 16–3025.1°C (21.8–28.7°C)10.7°C (8.6–13.0°C)18%8.9 mm (3.5–17.7 mm)
Jul 1–1528.8°C (25.7–32.1°C)13.0°C (10.9–15.2°C)8%2.8 mm (0.6–6.2 mm)
Jul 16–3130.9°C (28.0–33.8°C)14.3°C (12.1–16.3°C)6%1.2 mm (0.4–7.7 mm)
Aug 1–1530.5°C (27.4–33.0°C)14.1°C (11.9–16.1°C)7%1.6 mm (0.5–6.7 mm)
Aug 16–3128.3°C (25.3–30.9°C)12.7°C (10.6–14.8°C)8%3.5 mm (1.0–7.5 mm)
Sep 1–1525.6°C (21.6–29.0°C)10.5°C (8.0–12.8°C)12%4.3 mm (0.3–15.0 mm)
Sep 16–3022.5°C (18.6–26.0°C)8.7°C (6.5–10.5°C)19%10.0 mm (2.4–15.7 mm)
Oct 1–1517.0°C (14.5–21.0°C)5.7°C (3.1–7.9°C)24%13.9 mm (9.6–26.4 mm)
Oct 16–3114.2°C (11.6–17.0°C)3.5°C (0.9–6.1°C)37%32.7 mm (17.7–38.6 mm)
Nov 1–159.8°C (7.3–12.4°C)1.4°C (-1.5–4.0°C)44%29.7 mm (17.8–40.6 mm)
Nov 16–307.1°C (3.9–9.7°C)-0.2°C (-3.2–2.4°C)54%42.1 mm (26.6–61.5 mm)
Dec 1–154.2°C (1.5–7.1°C)-1.8°C (-4.5–0.8°C)52%42.8 mm (25.6–50.7 mm)
Dec 16–313.5°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
Cumulative growing degree daysBase 10°C

2026 season1991–2020 average

Growing degree days accumulated during the 2026 growing season The solid line accumulates daily mean temperature above 10 degrees Celsius from the configured growing-season start. The dashed line shows the 1991–2020 daily climatological average. 1106 GDD 0 Mar ’26AprMayJunJulAug
Cumulative growing-season rainfallRegional weighted mean

2026 season1991–2020 average

Rainfall accumulated during the 2026 growing season The solid line accumulates daily rainfall in millimeters from the configured growing-season start. The dashed line shows the 1991–2020 daily climatological average. 197 mm 0 Mar ’26AprMayJunJulAug
View growing-season accumulation data
DateSeason GDD1991–2020 average GDDSeason rainfall1991–2020 average rainfall
2026-03-150.00.30.2 mm3.5 mm
2026-03-160.00.40.5 mm5.6 mm
2026-03-173.70.50.5 mm7.5 mm
2026-03-187.50.70.5 mm9.1 mm
2026-03-1914.70.90.5 mm10.2 mm
2026-03-2020.21.10.6 mm12.3 mm
2026-03-2120.21.18.3 mm14.9 mm
2026-03-2220.21.38.3 mm17.7 mm
2026-03-2320.21.48.3 mm19.9 mm
2026-03-2422.31.713.4 mm22.7 mm
2026-03-2522.31.814.6 mm25.5 mm
2026-03-2622.31.914.6 mm27.6 mm
2026-03-2722.32.114.6 mm30.3 mm
2026-03-2822.32.214.6 mm33.0 mm
2026-03-2922.32.515.0 mm35.8 mm
2026-03-3022.32.915.1 mm37.3 mm
2026-03-3122.33.415.9 mm39.0 mm
2026-04-0122.33.926.6 mm40.7 mm
2026-04-0222.34.428.7 mm42.5 mm
2026-04-0322.35.128.7 mm44.4 mm
2026-04-0422.35.428.7 mm46.4 mm
2026-04-0525.55.728.7 mm48.4 mm
2026-04-0629.36.428.7 mm50.3 mm
2026-04-0732.67.328.7 mm52.4 mm
2026-04-0832.68.228.7 mm54.9 mm
2026-04-0933.08.928.7 mm57.0 mm
2026-04-1033.89.531.4 mm58.7 mm
2026-04-1136.110.037.1 mm60.7 mm
2026-04-1236.110.652.4 mm62.7 mm
2026-04-1336.111.459.4 mm65.1 mm
2026-04-1436.111.560.2 mm67.4 mm
2026-04-1536.112.068.3 mm69.6 mm
2026-04-1636.112.870.7 mm71.5 mm
2026-04-1736.113.970.7 mm73.0 mm
2026-04-1836.115.070.7 mm74.2 mm
2026-04-1939.716.370.7 mm75.6 mm
2026-04-2044.118.170.7 mm77.0 mm
2026-04-2148.320.075.5 mm77.9 mm
2026-04-2248.321.698.7 mm79.2 mm
2026-04-2348.323.0100.1 mm81.6 mm
2026-04-2448.324.0100.1 mm83.6 mm
2026-04-2548.325.4100.4 mm85.0 mm
2026-04-2648.327.0100.4 mm86.4 mm
2026-04-2748.329.1100.5 mm88.5 mm
2026-04-2848.830.6100.5 mm90.1 mm
2026-04-2950.431.9100.8 mm91.6 mm
2026-04-3053.333.3100.8 mm93.3 mm
2026-05-0159.835.0100.8 mm94.4 mm
2026-05-0268.437.3101.3 mm95.8 mm
2026-05-0376.939.4101.3 mm97.4 mm
2026-05-0485.242.1101.3 mm99.1 mm
2026-05-0592.844.9101.3 mm100.4 mm
2026-05-06100.547.4101.3 mm101.9 mm
2026-05-07106.850.1101.3 mm102.7 mm
2026-05-08111.853.2101.3 mm104.4 mm
2026-05-09116.155.8101.3 mm105.7 mm
2026-05-10121.958.7101.3 mm106.8 mm
2026-05-11126.462.4101.3 mm108.5 mm
2026-05-12134.166.2101.3 mm109.8 mm
2026-05-13138.569.9104.6 mm111.3 mm
2026-05-14139.874.2105.1 mm113.1 mm
2026-05-15140.378.5105.6 mm115.5 mm
2026-05-16140.383.1107.5 mm117.8 mm
2026-05-17140.387.6108.6 mm121.0 mm
2026-05-18141.191.8108.8 mm123.6 mm
2026-05-19144.096.0108.9 mm126.1 mm
2026-05-20147.799.3108.9 mm129.4 mm
2026-05-21152.2102.5108.9 mm131.7 mm
2026-05-22157.8106.2108.9 mm133.4 mm
2026-05-23165.7110.7108.9 mm134.2 mm
2026-05-24174.0115.9108.9 mm135.1 mm
2026-05-25182.5120.6109.1 mm137.0 mm
2026-05-26184.0125.1112.3 mm138.7 mm
2026-05-27189.6129.7112.3 mm140.0 mm
2026-05-28199.1134.6114.3 mm141.4 mm
2026-05-29205.6140.1114.4 mm142.5 mm
2026-05-30209.0146.1114.4 mm143.6 mm
2026-05-31212.1152.4114.4 mm145.4 mm
2026-06-01217.2158.9114.4 mm146.2 mm
2026-06-02223.3165.2114.4 mm148.2 mm
2026-06-03231.3171.6114.7 mm149.3 mm
2026-06-04238.0178.0114.7 mm152.2 mm
2026-06-05242.8183.8114.7 mm154.2 mm
2026-06-06246.1189.1114.7 mm155.7 mm
2026-06-07248.0194.7114.7 mm156.9 mm
2026-06-08252.2200.0116.8 mm158.7 mm
2026-06-09257.4205.2124.2 mm160.5 mm
2026-06-10261.3210.6125.4 mm161.9 mm
2026-06-11265.6216.2125.4 mm162.5 mm
2026-06-12272.9221.9125.4 mm164.1 mm
2026-06-13280.2227.9125.4 mm165.6 mm
2026-06-14289.0233.7125.4 mm166.3 mm
2026-06-15299.6239.4125.4 mm167.3 mm
2026-06-16313.0245.5125.4 mm167.9 mm
2026-06-17322.2252.1125.4 mm168.5 mm
2026-06-18331.2258.7125.4 mm170.1 mm
2026-06-19342.6265.0125.4 mm171.2 mm
2026-06-20355.0272.2125.4 mm171.7 mm
2026-06-21364.4280.1125.4 mm172.3 mm
2026-06-22374.4288.0125.4 mm172.7 mm
2026-06-23385.4296.1125.4 mm173.0 mm
2026-06-24396.6304.2125.4 mm173.8 mm
2026-06-25407.7312.7125.4 mm174.4 mm
2026-06-26414.5321.9127.0 mm175.8 mm
2026-06-27419.4331.4127.2 mm177.0 mm
2026-06-28424.7341.3127.6 mm177.6 mm
2026-06-29431.0351.3131.7 mm178.5 mm
2026-06-30437.9361.3131.9 mm178.7 mm
2026-07-01443.4371.6131.9 mm178.9 mm
2026-07-02449.4381.7131.9 mm179.3 mm
2026-07-03458.5391.9131.9 mm179.6 mm
2026-07-04469.8401.9131.9 mm179.8 mm
2026-07-05479.9412.0131.9 mm180.2 mm
2026-07-06489.7422.5132.0 mm180.5 mm
2026-07-07503.3433.2132.0 mm180.7 mm
2026-07-08517.4444.2132.0 mm181.3 mm
2026-07-09529.7455.7132.0 mm182.3 mm
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2026-07-12565.9490.1132.0 mm182.9 mm
2026-07-13578.9501.6132.0 mm183.2 mm
2026-07-14594.1513.0132.0 mm183.4 mm
2026-07-15611.4524.6132.9 mm183.5 mm
2026-07-16627.3536.2133.2 mm183.7 mm
2026-07-17639.8548.1133.2 mm184.0 mm
2026-07-18652.4559.7133.2 mm184.2 mm
2026-07-19663.7571.5133.2 mm184.8 mm
2026-07-20675.3583.4133.2 mm185.1 mm
2026-07-21688.6595.7133.2 mm185.1 mm
2026-07-22705.7608.3133.2 mm185.6 mm
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2026-07-24738.1633.1133.2 mm186.4 mm
2026-07-25751.9645.3133.2 mm186.5 mm
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2026-07-27773.9671.3133.2 mm186.6 mm
2026-07-28785.7685.0133.2 mm186.6 mm
2026-07-29796.0698.4133.2 mm187.1 mm
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2026-07-31820.6724.3133.2 mm187.6 mm
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2026-08-02840.0749.9133.2 mm187.9 mm
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2026-08-04854.7775.2133.2 mm188.1 mm
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2026-08-06880.7800.8133.2 mm188.8 mm
2026-08-07896.3812.4133.2 mm190.6 mm
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2026-08-10934.4847.3133.2 mm191.2 mm
2026-08-11945.9858.9133.2 mm191.5 mm
2026-08-12957.7870.4133.2 mm191.7 mm
2026-08-13968.7882.3133.2 mm191.8 mm
2026-08-14980.3894.3133.2 mm192.3 mm
2026-08-15992.8906.4134.2 mm192.5 mm
2026-08-161005.5917.8134.7 mm193.4 mm
2026-08-171019.7929.4134.7 mm193.5 mm
2026-08-181033.8941.0134.7 mm193.6 mm
2026-08-191046.8952.6134.7 mm193.9 mm
2026-08-201061.2964.0134.7 mm194.5 mm
2026-08-211078.0974.8134.7 mm194.8 mm
2026-08-221095.5984.8134.9 mm196.3 mm
2026-08-231106.2994.1134.9 mm196.7 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.

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.