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United States · Detailed regional profile

Willamette Valley

Oregon's best-known cool-climate wine region, especially for Pinot Noir and Chardonnay.

The growing season is long and cool. Spring frost, the amount of summer warmth, and autumn rain can all shape the year.

Climate comparisons use the 1991–2020 combined regional record · updated through Aug 20, 2026.

Vineyards in Oregon's Willamette Valley
Doug Kerr / Wikimedia Commons

Current conditions

Observations through Aug 31, 2026 · 00:30 UTC

Temperature24.1°C
Dew Point8.7°C
Relative Humidity37%
24h Rainfall0.9 mmmodeled IFS total through Aug 29
NWS station average · 2 stations

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.

  • CRVO — CORVALLIS · 30% regional weight
  • KMMV — McMinnville, McMinnville Municipal Airport · 70% 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 moderately drier than normal.

Mean temperature14.6°C
Temperature anomaly-0.5°Cvs 1991-2020
Growing degree days1186base 10°C
Hot days10≥ 32°C

What stood out in 1991

Frost exposure can vary sharply from one site to the next.

Spring frost recorded · Low confidence

The regional record had 1 spring day(s) at or below 0°C.

Frost exposure can vary sharply from one site to the next.

How unusual was 1991?

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

Growing-season temperature

6th coolest of 35 vintages Cooler than 28 of 34 other vintages 14.6°C

Growing-season rainfall

16th driest of 35 vintages Drier than 19 of 34 other vintages 433.6 mm

Heat accumulation

9th lowest of 35 vintages Lower than 26 of 34 other vintages 1186 GDD

Hot days

13th fewest of 35 vintages Fewer than 21 of 34 other vintages 10 days

1991 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

    1991 3 GDD
    Typical 11 GDD

    Rainfall

    1991 164.2 mm
    Typical 147.2 mm
    1991 freezing days
    1
    Typical
    3.4

    Close to the typical monthly pattern.

  2. 1–30
    Frost watchGrowing season

    Heat accumulation

    1991 22 GDD
    Typical 37 GDD

    Rainfall

    1991 133.9 mm
    Typical 108.3 mm
    1991 freezing days
    0
    Typical
    0.6

    Close to the typical monthly pattern.

  3. 1–31
    Frost watchGrowing season

    Heat accumulation

    1991 54 GDD
    Typical 118 GDD

    Rainfall

    1991 115.6 mm
    Typical 71.5 mm
    1991 freezing days
    0
    Typical
    0.0

    Heat accumulation ran behind the typical month.

  4. 1–30
    Growing season

    Heat accumulation

    1991 131 GDD
    Typical 190 GDD

    Rainfall

    1991 48.0 mm
    Typical 43.5 mm

    Heat accumulation ran behind the typical month.

  5. 1–31
    Growing season

    Heat accumulation

    1991 305 GDD
    Typical 305 GDD

    Rainfall

    1991 9.1 mm
    Typical 10.4 mm

    Close to the typical monthly pattern.

  6. 1–31
    Growing season

    Heat accumulation

    1991 304 GDD
    Typical 309 GDD

    Rainfall

    1991 21.2 mm
    Typical 13.3 mm

    Close to the typical monthly pattern.

  7. 1–30
    Growing seasonHarvest window

    Heat accumulation

    1991 258 GDD
    Typical 219 GDD

    Rainfall

    1991 4.6 mm
    Typical 42.4 mm

    Drier than the typical month.

  8. 1–31
    Growing seasonHarvest window

    Heat accumulation

    1991 109 GDD
    Typical 76 GDD

    Rainfall

    1991 65.5 mm
    Typical 106.1 mm

    Heat accumulation ran ahead of the typical month.

View milestone calendar data as a table
Month1991 GDDTypical GDD1991 rainfallTypical rainfall1991 freezing daysTypical freezing days
March 1991 3 GDD 11 GDD 164.2 mm 147.2 mm 13.4
April 1991 22 GDD 37 GDD 133.9 mm 108.3 mm 00.6
May 1991 54 GDD 118 GDD 115.6 mm 71.5 mm 00.0
June 1991 131 GDD 190 GDD 48.0 mm 43.5 mm Outside frost windowOutside frost window
July 1991 305 GDD 305 GDD 9.1 mm 10.4 mm Outside frost windowOutside frost window
August 1991 304 GDD 309 GDD 21.2 mm 13.3 mm Outside frost windowOutside frost window
September 1991 258 GDD 219 GDD 4.6 mm 42.4 mm Outside frost windowOutside frost window
October 1991 109 GDD 76 GDD 65.5 mm 106.1 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 1991 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

    2000

    Most alike in Growing-season mean temperature and Growing degree days.

    Growing-season mean temperature
    warmer: 0.1°C
    Growing degree days
    lower: 31 GDD

    Largest difference: Hot-day count — fewer hot days

    View 2000 →

  2. Second closest

    2011

    Most alike in Harvest precipitation and Hot-day count.

    Harvest precipitation
    more rain: 16.9 mm
    Hot-day count
    fewer hot days: 3 days

    Largest difference: Growing-season mean temperature — cooler

    View 2011 →

  3. Third closest

    2007

    Most alike in Growing-season mean temperature and Growing degree days.

    Growing-season mean temperature
    the same: 0.0°C
    Growing degree days
    lower: 42 GDD

    Largest difference: Harvest precipitation — more rain

    View 2007 →
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: 2000 0.653; 2011 0.662; 2007 0.813.

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. +1.5°C −1.5°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. +300 mm −300 mm 1991 2000 2010 2020 2026
View historical chart data as a table
YearTemperature anomalyRainfall anomalyHot days
1991-0.5°C-41 mm10
1992+1.1°C-108 mm18
1993-0.1°C+151 mm5
1994+0.2°C-25 mm7
1995+0.0°C+63 mm8
1996-0.4°C+126 mm15
1997+0.1°C+177 mm5
1998+0.0°C-1 mm16
1999-0.8°C-95 mm1
2000-0.4°C-109 mm4
2001-0.7°C-59 mm3
2002-0.4°C-208 mm11
2003+0.5°C-43 mm18
2004+0.7°C-6 mm13
2005-0.0°C+123 mm13
2006+0.1°C-150 mm15
2007-0.5°C-74 mm7
2008-1.0°C-129 mm14
2009-0.1°C-34 mm16
2010-0.8°C+194 mm10
2011-1.0°C+28 mm7
2012-0.4°C+207 mm9
2013+0.2°C+22 mm9
2014+1.1°C+84 mm15
2015+1.3°C-134 mm22
2016+0.6°C+117 mm15
2017+0.3°C+123 mm17
2018+0.3°C-117 mm21
2019-0.0°C-2 mm6
2020+0.3°C-80 mm12
2021+0.7°C-129 mm20
2022+0.6°C+19 mm20
2023+0.7°C-38 mm15
2024+0.7°C-89 mm19
2025+0.9°C-43 mm17
2026+0.9°C-294 mm11

winter

4.6°C

-0.7°C vs baseline

294 mm rain · -242 mm

spring

9.4°C

-1.3°C vs baseline

413 mm rain · +87 mm

summer

18.0°C

-0.7°C vs baseline

78 mm rain · +11 mm

harvest

15.5°C

+0.8°C vs baseline

70 mm rain · -78 mm

Weather events

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

  1. Spring frost exposure

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

    The regional model recorded freezing temperatures during spring.

  2. Dry spell

    Duration
    15 days
    Total rain
    0.5 mm
    Daily cutoff
    1.0 mm/day

  3. Heat episode

    Peak temperature
    32.8°C
    Duration
    2 days
    Heat accumulation
    27 GDD

  4. Dry spell

    Duration
    14 days
    Total rain
    1.1 mm
    Daily cutoff
    1.0 mm/day

  5. Dry spell

    Duration
    16 days
    Total rain
    0.9 mm
    Daily cutoff
    1.0 mm/day

  6. Heat episode

    Peak temperature
    32.8°C
    Duration
    2 days
    Heat accumulation
    25 GDD

  7. Dry spell

    Duration
    44 days
    Total rain
    2.0 mm
    Daily cutoff
    1.0 mm/day

  8. Heat episode

    Peak temperature
    33.0°C
    Duration
    2 days
    Heat accumulation
    26 GDD

  9. Heat episode

    Peak temperature
    33.0°C
    Duration
    2 days
    Heat accumulation
    25 GDD

  10. Concentrated harvest rain

    Total rain
    41.6 mm
    Highest 3-day total
    39.3 mm
    Trigger threshold
    32.5 mm

    A large share of the season's rain fell during the harvest period.

How events are detected

Weather & Vines combined regional series; method event-timeline-v2-2026-07, rules willamette-v2-2026-07. 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 +54.1 GDD per decade. The 95% interval is +15.3 to +92.8 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
19911186 GDD-75 GDD
19921470 GDD+209 GDD
19931194 GDD-67 GDD
19941288 GDD+28 GDD
19951265 GDD+4 GDD
19961181 GDD-80 GDD
19971278 GDD+17 GDD
19981277 GDD+16 GDD
19991112 GDD-149 GDD
20001156 GDD-105 GDD
20011127 GDD-134 GDD
20021194 GDD-67 GDD
20031380 GDD+120 GDD
20041381 GDD+120 GDD
20051242 GDD-19 GDD
20061291 GDD+30 GDD
20071144 GDD-117 GDD
20081135 GDD-126 GDD
20091267 GDD+6 GDD
20101083 GDD-178 GDD
20111085 GDD-175 GDD
20121197 GDD-64 GDD
20131304 GDD+44 GDD
20141490 GDD+229 GDD
20151514 GDD+253 GDD
20161346 GDD+85 GDD
20171317 GDD+56 GDD
20181336 GDD+75 GDD
20191239 GDD-22 GDD
20201347 GDD+86 GDD
20211436 GDD+175 GDD
20221411 GDD+150 GDD
20231487 GDD+226 GDD
20241388 GDD+127 GDD
20251431 GDD+170 GDD
Growing-season mean temperature
+0.23 °C per decade 95% interval +0.04 to +0.43
Growing degree days
+54.05 GDD per decade 95% interval +15.26 to +92.85
Growing-season precipitation
-9.61 mm per decade 95% interval -41.01 to +21.79
Hot days
+2.68 days per decade 95% interval +1.37 to +3.99
Spring frost days
+0.96 days per decade 95% interval -0.38 to +2.29
Longest dry spell
+6.02 days per decade 95% interval +1.07 to +10.97

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+0.9°C+0.5 to +1.3°C25
2041-2060+1.4°C+1.0 to +2.3°C25
2061-2075+1.9°C+1.5 to +2.9°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 29°C 22°C 20°C 16°C 19°C 19°C 23°C 25°C 26°C
Low 11°C 13°C 15°C 13°C 14°C 13°C 10°C 9°C 11°C 13°C
Rain 0.0 mm 0.0 mm 1.0 mm 7.2 mm 21.5 mm 2.8 mm 0.1 mm 0.0 mm 0.0 mm 0.0 mm

Across the typical year: Early August has the warmest median afternoon high (28.5°C); Late December has the coolest (7.6°C). Wet days are most frequent in Late November (73%) and least frequent in Early August (7%). 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 Willamette 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. -5°C5°C15°C25°C35°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 Willamette 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.

Willamette 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 1–158.1°C (6.0–10.3°C)1.6°C (-0.6–4.2°C)67%82.0 mm (47.3–111.1 mm)
Jan 16–319.1°C (7.1–10.9°C)2.1°C (-0.4–4.4°C)62%87.9 mm (60.6–132.3 mm)
Feb 1–1510.4°C (8.6–12.3°C)1.9°C (-0.2–4.3°C)59%54.5 mm (33.4–88.9 mm)
Feb 16–2910.8°C (8.8–12.8°C)2.0°C (-0.1–4.5°C)65%66.2 mm (36.4–92.1 mm)
Mar 1–1512.2°C (9.9–14.7°C)2.9°C (0.8–5.2°C)65%63.6 mm (36.8–111.6 mm)
Mar 16–3113.2°C (11.3–15.6°C)3.3°C (1.8–5.2°C)65%64.2 mm (48.3–95.3 mm)
Apr 1–1513.9°C (12.3–16.5°C)4.2°C (2.7–6.1°C)70%55.3 mm (40.9–83.5 mm)
Apr 16–3016.3°C (13.9–19.0°C)5.3°C (3.6–6.9°C)55%40.3 mm (20.7–65.4 mm)
May 1–1518.2°C (15.4–21.8°C)6.8°C (4.9–8.6°C)41%29.3 mm (14.7–48.7 mm)
May 16–3119.8°C (17.0–23.2°C)8.6°C (6.9–10.0°C)44%30.9 mm (15.1–59.4 mm)
Jun 1–1521.2°C (18.4–24.1°C)9.4°C (7.8–10.7°C)40%26.6 mm (12.5–40.4 mm)
Jun 16–3023.3°C (20.7–26.7°C)10.4°C (8.9–11.8°C)24%15.3 mm (5.1–23.7 mm)
Jul 1–1526.4°C (23.7–29.1°C)11.6°C (10.3–12.9°C)10%3.0 mm (1.0–8.0 mm)
Jul 16–3128.2°C (25.7–31.4°C)12.4°C (11.1–13.8°C)8%1.2 mm (0.2–2.8 mm)
Aug 1–1528.5°C (25.7–31.1°C)12.5°C (11.2–13.7°C)7%2.7 mm (0.3–5.2 mm)
Aug 16–3127.3°C (24.8–29.8°C)11.8°C (10.3–13.1°C)13%4.4 mm (1.3–14.3 mm)
Sep 1–1525.8°C (22.5–28.8°C)10.7°C (9.1–12.2°C)16%7.6 mm (1.4–25.5 mm)
Sep 16–3023.0°C (20.2–26.0°C)9.4°C (7.7–11.1°C)30%19.5 mm (9.2–37.0 mm)
Oct 1–1518.5°C (16.3–21.8°C)7.3°C (5.2–9.3°C)41%33.2 mm (16.9–51.6 mm)
Oct 16–3116.0°C (13.8–18.1°C)5.9°C (3.7–8.1°C)50%65.4 mm (27.2–83.0 mm)
Nov 1–1512.6°C (11.0–14.2°C)4.6°C (2.1–7.1°C)62%68.3 mm (35.4–102.8 mm)
Nov 16–3010.1°C (8.3–11.7°C)2.9°C (0.5–5.3°C)73%115.8 mm (63.9–144.5 mm)
Dec 1–158.3°C (6.4–10.0°C)1.9°C (-0.5–4.1°C)70%111.9 mm (53.1–141.1 mm)
Dec 16–317.6°C (5.6–9.3°C)1.5°C (-0.7–3.7°C)67%104.4 mm (69.8–143.1 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 days1022.9base 10°C
Growing-season rainfall180.9 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. 1023 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. 321 mm 0 Mar ’26AprMayJunJulAug
View growing-season accumulation data
DateSeason GDD1991–2020 average GDDSeason rainfall1991–2020 average rainfall
2026-03-150.00.40.8 mm6.8 mm
2026-03-162.30.51.4 mm12.0 mm
2026-03-175.60.71.4 mm16.0 mm
2026-03-189.21.01.4 mm19.3 mm
2026-03-1913.51.52.0 mm22.6 mm
2026-03-2017.02.03.1 mm27.0 mm
2026-03-2117.02.45.8 mm31.8 mm
2026-03-2217.02.75.9 mm37.4 mm
2026-03-2317.02.96.0 mm42.1 mm
2026-03-2417.53.211.2 mm46.9 mm
2026-03-2517.53.515.5 mm51.1 mm
2026-03-2617.53.816.0 mm55.6 mm
2026-03-2717.54.016.1 mm60.5 mm
2026-03-2817.54.316.1 mm65.0 mm
2026-03-2917.54.916.5 mm70.6 mm
2026-03-3017.55.717.0 mm75.2 mm
2026-03-3117.56.617.7 mm79.3 mm
2026-04-0117.57.532.1 mm82.3 mm
2026-04-0217.58.240.6 mm85.5 mm
2026-04-0317.58.941.1 mm88.4 mm
2026-04-0418.99.541.1 mm91.6 mm
2026-04-0524.110.041.1 mm96.2 mm
2026-04-0630.211.041.1 mm100.7 mm
2026-04-0732.512.141.1 mm106.1 mm
2026-04-0834.113.341.1 mm112.2 mm
2026-04-0937.414.241.3 mm116.9 mm
2026-04-1042.415.044.6 mm121.2 mm
2026-04-1145.615.959.3 mm125.0 mm
2026-04-1246.417.064.9 mm129.1 mm
2026-04-1346.517.767.1 mm133.5 mm
2026-04-1446.518.172.5 mm138.2 mm
2026-04-1546.518.993.7 mm142.3 mm
2026-04-1646.520.097.7 mm146.0 mm
2026-04-1746.521.398.1 mm149.6 mm
2026-04-1848.422.898.2 mm152.4 mm
2026-04-1953.524.298.2 mm154.7 mm
2026-04-2057.925.9100.5 mm157.6 mm
2026-04-2160.727.4110.6 mm159.9 mm
2026-04-2261.328.6115.1 mm163.3 mm
2026-04-2361.630.1116.0 mm167.2 mm
2026-04-2462.531.7116.1 mm172.1 mm
2026-04-2563.933.7116.1 mm174.7 mm
2026-04-2665.235.5116.2 mm177.7 mm
2026-04-2765.437.4116.3 mm180.4 mm
2026-04-2866.739.5116.3 mm182.8 mm
2026-04-2967.841.5116.3 mm185.4 mm
2026-04-3072.643.5116.4 mm187.7 mm
2026-05-0178.345.7116.7 mm189.2 mm
2026-05-0283.448.2117.1 mm191.9 mm
2026-05-0392.350.9117.2 mm195.3 mm
2026-05-0499.453.8117.3 mm197.9 mm
2026-05-05105.356.9117.4 mm200.0 mm
2026-05-06110.459.7117.4 mm201.8 mm
2026-05-07115.762.6117.4 mm203.5 mm
2026-05-08119.965.6117.4 mm205.8 mm
2026-05-09125.368.4117.5 mm207.8 mm
2026-05-10130.871.4117.5 mm209.7 mm
2026-05-11137.274.6117.5 mm211.6 mm
2026-05-12144.977.7118.0 mm213.5 mm
2026-05-13149.581.2123.9 mm215.4 mm
2026-05-14152.885.5124.5 mm217.9 mm
2026-05-15153.689.8126.0 mm220.8 mm
2026-05-16154.394.0129.6 mm223.4 mm
2026-05-17154.798.1131.7 mm227.2 mm
2026-05-18157.6102.2132.2 mm230.5 mm
2026-05-19161.0106.1132.2 mm233.4 mm
2026-05-20165.8109.6132.3 mm236.0 mm
2026-05-21172.9113.1132.3 mm238.7 mm
2026-05-22180.6117.1132.3 mm241.4 mm
2026-05-23187.4121.7132.3 mm243.3 mm
2026-05-24194.0126.5132.3 mm245.2 mm
2026-05-25197.7131.3136.3 mm247.2 mm
2026-05-26201.6136.1139.3 mm249.1 mm
2026-05-27208.2141.0139.4 mm251.2 mm
2026-05-28215.9145.7139.5 mm253.4 mm
2026-05-29220.2150.7140.7 mm255.6 mm
2026-05-30222.4155.8141.3 mm257.1 mm
2026-05-31225.2161.5141.3 mm259.2 mm
2026-06-01231.8167.3141.3 mm261.2 mm
2026-06-02241.5172.8141.3 mm263.3 mm
2026-06-03249.2178.5141.9 mm265.1 mm
2026-06-04255.5184.4142.0 mm267.1 mm
2026-06-05259.7190.1142.2 mm269.5 mm
2026-06-06262.9195.5144.1 mm271.7 mm
2026-06-07265.3200.9145.3 mm273.9 mm
2026-06-08268.5206.1154.7 mm275.9 mm
2026-06-09272.6211.3159.2 mm277.6 mm
2026-06-10277.2216.2160.7 mm279.7 mm
2026-06-11282.9221.5160.7 mm281.1 mm
2026-06-12290.6227.0160.8 mm282.5 mm
2026-06-13301.5232.7160.8 mm284.3 mm
2026-06-14315.5237.9160.8 mm285.7 mm
2026-06-15331.1243.2160.8 mm287.1 mm
2026-06-16342.7248.7160.8 mm288.1 mm
2026-06-17351.5254.5160.8 mm289.1 mm
2026-06-18360.3260.8160.8 mm290.0 mm
2026-06-19370.5267.0160.8 mm291.0 mm
2026-06-20378.8273.8160.8 mm292.3 mm
2026-06-21386.5281.1160.8 mm293.1 mm
2026-06-22397.4287.9160.8 mm294.0 mm
2026-06-23410.6294.8160.8 mm295.1 mm
2026-06-24423.4302.1160.8 mm296.4 mm
2026-06-25431.3309.8163.9 mm297.4 mm
2026-06-26438.5317.9166.8 mm298.4 mm
2026-06-27443.4326.5171.1 mm299.8 mm
2026-06-28448.8335.0173.8 mm301.1 mm
2026-06-29453.7343.3174.9 mm302.3 mm
2026-06-30458.8351.8175.1 mm302.6 mm
2026-07-01464.5360.3175.2 mm303.1 mm
2026-07-02470.5369.0175.2 mm303.4 mm
2026-07-03479.7377.4175.2 mm303.7 mm
2026-07-04489.1385.6175.2 mm304.1 mm
2026-07-05498.6394.0175.2 mm304.4 mm
2026-07-06509.4402.7175.2 mm304.7 mm
2026-07-07519.6411.6175.2 mm304.9 mm
2026-07-08529.8420.9175.2 mm305.3 mm
2026-07-09539.1430.5175.2 mm306.2 mm
2026-07-10548.5440.0175.2 mm306.8 mm
2026-07-11557.5449.3175.3 mm307.0 mm
2026-07-12565.8459.1175.3 mm307.3 mm
2026-07-13575.7468.9175.3 mm307.6 mm
2026-07-14587.1478.6175.3 mm307.8 mm
2026-07-15598.6488.5175.3 mm308.0 mm
2026-07-16606.5498.7178.3 mm308.5 mm
2026-07-17614.2508.7178.4 mm309.3 mm
2026-07-18623.0518.5178.4 mm310.0 mm
2026-07-19633.7528.4178.4 mm310.4 mm
2026-07-20646.8538.4178.4 mm310.6 mm
2026-07-21662.7548.8178.4 mm310.9 mm
2026-07-22678.1559.6179.3 mm311.4 mm
2026-07-23690.7570.3180.2 mm311.8 mm
2026-07-24702.5580.9180.3 mm312.0 mm
2026-07-25711.3591.3180.3 mm312.1 mm
2026-07-26721.4602.1180.3 mm312.2 mm
2026-07-27731.0613.4180.3 mm312.2 mm
2026-07-28740.7624.7180.3 mm312.3 mm
2026-07-29750.7635.7180.3 mm312.5 mm
2026-07-30760.2646.6180.3 mm312.9 mm
2026-07-31770.8657.2180.3 mm313.0 mm
2026-08-01780.5667.7180.5 mm313.1 mm
2026-08-02788.3678.1180.5 mm313.2 mm
2026-08-03797.6688.5180.5 mm313.3 mm
2026-08-04810.3699.6180.5 mm313.3 mm
2026-08-05823.2710.3180.5 mm313.5 mm
2026-08-06836.8720.4180.5 mm313.8 mm
2026-08-07849.8730.0180.5 mm314.5 mm
2026-08-08862.5739.7180.5 mm314.8 mm
2026-08-09873.8750.0180.5 mm315.1 mm
2026-08-10884.1760.5180.5 mm315.3 mm
2026-08-11895.2770.8180.5 mm315.6 mm
2026-08-12906.3781.2180.7 mm315.9 mm
2026-08-13916.9792.0180.7 mm316.1 mm
2026-08-14927.4803.1180.7 mm316.2 mm
2026-08-15936.9813.8180.7 mm316.4 mm
2026-08-16947.2824.1180.7 mm316.6 mm
2026-08-17957.3834.3180.7 mm316.9 mm
2026-08-18967.9844.5180.7 mm317.1 mm
2026-08-19979.0854.8180.7 mm317.8 mm
2026-08-20992.3864.8180.7 mm318.6 mm
2026-08-211003.2874.2180.7 mm319.4 mm
2026-08-221011.8883.5180.7 mm320.5 mm
2026-08-231022.9892.5180.9 mm321.3 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
68 GDDvs 85 GDD average
Total rainfall
32.7 mmvs 7.5 mm average

A notable amount of rain is forecast during the period. The 10-day total meets the 30 mm forecast threshold, with rain forecast Sep 1–5.

Sun8/30 23°Cavg 26°C 11°Cavg 12°C +7 GDD 0.0 mm
Mon8/31 29°Cavg 26°C 13°Cavg 11°C +9 GDD 0.0 mm
Tue9/1 22°Cavg 26°C 15°Cavg 11°C +8 GDD 1.0 mm
Wed9/2 20°Cavg 27°C 13°Cavg 11°C +6 GDD 7.2 mm
Thu9/3 16°Cavg 27°C 14°Cavg 11°C +5 GDD 21.5 mm
Fri9/4 19°Cavg 26°C 13°Cavg 11°C +5 GDD 2.8 mm
Sat9/5 19°Cavg 26°C 10°Cavg 11°C +5 GDD 0.1 mm
Sun9/6 23°Cavg 26°C 9°Cavg 10°C +6 GDD 0.0 mm
Mon9/7 25°Cavg 26°C 11°Cavg 10°C +7 GDD 0.0 mm
Tue9/8 26°Cavg 26°C 13°Cavg 11°C +10 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 Willamette Valley model uses a March 15–October 31 growing season, base 10°C GDD, and an operational hot-day marker of 32°C.

The historical series uses 3 ERA5 locations, 34 temperature stations, and 39 rain stations. Interpretation confidence: high. Geometry confidence: authoritative. Rules: willamette-v2-2026-07.