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United States · Multi-region weather view

Sonoma & Mendocino

North Coast valleys from Sonoma through Mendocino and Anderson Valley.

Fog and Pacific air cool the western valleys, while vineyards farther inland receive more heat.

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

Current conditions

Observations through Aug 31, 2026 · 00:30 UTC

Temperature27.1°C
Dew Point9.8°C
Relative Humidity34%
24h Rainfall0.0 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.

  • BNVC1 — BOONVILLE · 50% regional weight
  • KSTS — Santa Rosa, Santa Rosa Sonoma County Airport · 50% 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 significantly wetter than normal.

Mean temperature16.2°C
Temperature anomaly-0.7°Cvs 1991-2020
Growing degree days1343base 10°C
Hot days6≥ 32°C

What stood out in 2011

No single weather pattern stands out in the regional record.

Close to the usual range · Low confidence

Temperature, rainfall, heat, and frost all stayed within the site's published thresholds.

No single weather pattern stands out in the regional record.

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 16.2°C

Growing-season rainfall

5th wettest of 35 vintages Wetter than 30 of 34 other vintages 252.0 mm

Heat accumulation

2nd lowest of 35 vintages Lower than 33 of 34 other vintages 1343 GDD

Hot days

6th fewest of 35 vintages Fewer than 26 of 34 other vintages 6 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 watch

    Heat accumulation

    2011 0 GDD
    Typical 52 GDD

    Rainfall

    2011 349.5 mm
    Typical 146.6 mm
    2011 freezing days
    0
    Typical
    0.4

    Heat accumulation ran behind the typical month.

  2. 1–30
    Frost watchGrowing season

    Heat accumulation

    2011 52 GDD
    Typical 81 GDD

    Rainfall

    2011 27.1 mm
    Typical 73.1 mm
    2011 freezing days
    0
    Typical
    0.2

    Heat accumulation ran behind the typical month.

  3. 1–31
    Frost watchGrowing season

    Heat accumulation

    2011 88 GDD
    Typical 154 GDD

    Rainfall

    2011 65.0 mm
    Typical 40.0 mm
    2011 freezing days
    0
    Typical
    0.0

    Heat accumulation ran behind the typical month.

  4. 1–30
    Growing season

    Heat accumulation

    2011 189 GDD
    Typical 229 GDD

    Rainfall

    2011 55.9 mm
    Typical 12.7 mm

    Wetter than the typical month.

  5. 1–31
    Growing season

    Heat accumulation

    2011 268 GDD
    Typical 294 GDD

    Rainfall

    2011 1.9 mm
    Typical 1.5 mm

    Close to the typical monthly pattern.

  6. 1–31
    Growing season

    Heat accumulation

    2011 276 GDD
    Typical 297 GDD

    Rainfall

    2011 1.5 mm
    Typical 2.5 mm

    Close to the typical monthly pattern.

  7. 1–30
    Growing seasonHarvest window

    Heat accumulation

    2011 288 GDD
    Typical 263 GDD

    Rainfall

    2011 3.7 mm
    Typical 5.9 mm

    Close to the typical monthly pattern.

  8. 1–31
    Growing seasonHarvest window

    Heat accumulation

    2011 181 GDD
    Typical 178 GDD

    Rainfall

    2011 96.9 mm
    Typical 52.4 mm

    Wetter than the typical month.

View milestone calendar data as a table
Month2011 GDDTypical GDD2011 rainfallTypical rainfall2011 freezing daysTypical freezing days
March 2011 0 GDD 52 GDD 349.5 mm 146.6 mm 00.4
April 2011 52 GDD 81 GDD 27.1 mm 73.1 mm 00.2
May 2011 88 GDD 154 GDD 65.0 mm 40.0 mm 00.0
June 2011 189 GDD 229 GDD 55.9 mm 12.7 mm Outside frost windowOutside frost window
July 2011 268 GDD 294 GDD 1.9 mm 1.5 mm Outside frost windowOutside frost window
August 2011 276 GDD 297 GDD 1.5 mm 2.5 mm Outside frost windowOutside frost window
September 2011 288 GDD 263 GDD 3.7 mm 5.9 mm Outside frost windowOutside frost window
October 2011 181 GDD 178 GDD 96.9 mm 52.4 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

214 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

    2007

    Most alike in Spring frost exposure and Growing degree days.

    Spring frost exposure
    the same: 0 days
    Growing degree days
    higher: 10 GDD

    Largest difference: Growing-season precipitation — less rain

    View 2007 →

  2. Second closest

    2000

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

    Spring frost exposure
    the same: 0 days
    Growing-season precipitation
    less rain: 2.4 mm

    Largest difference: Growing-season mean temperature — warmer

    View 2000 →

  3. Third closest

    2005

    Most alike in Hot-day count and Spring frost exposure.

    Hot-day count
    the same: 0 days
    Spring frost exposure
    the same: 0 days

    Largest difference: Harvest precipitation — less rain

    View 2005 →
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: 2007 0.357; 2000 0.592; 2005 0.687.

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. +1.6°C −1.6°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. +280 mm −280 mm 1991 2000 2010 2020 2026
View historical chart data as a table
YearTemperature anomalyRainfall anomalyHot days
1991-0.4°C-55 mm6
1992+0.9°C+6 mm6
1993+0.1°C+44 mm10
1994-0.3°C-52 mm3
1995-0.2°C+23 mm14
1996+0.1°C+50 mm15
1997+0.5°C+15 mm7
1998-0.6°C+61 mm17
1999-0.7°C-63 mm11
2000-0.2°C+61 mm9
2001+0.1°C-86 mm16
2002-0.4°C-132 mm18
2003+0.1°C+60 mm21
2004+0.3°C-25 mm12
2005-0.4°C+101 mm6
2006-0.0°C+38 mm14
2007-0.7°C+10 mm4
2008-0.2°C-123 mm17
2009-0.4°C+11 mm11
2010-1.1°C+266 mm9
2011-0.7°C+64 mm6
2012-0.5°C-39 mm5
2013+0.1°C-63 mm11
2014+0.9°C-59 mm15
2015+0.9°C-96 mm15
2016+0.3°C+83 mm8
2017+0.7°C-18 mm20
2018+0.0°C-1 mm2
2019+0.6°C+0 mm13
2020+1.4°C-82 mm18
2021+0.5°C+72 mm14
2022+0.4°C-4 mm11
2023+0.1°C-83 mm10
2024+0.9°C-89 mm23
2025+0.2°C-67 mm3
2026+0.4°C-70 mm4

winter

8.8°C

-0.2°C vs baseline

475 mm rain · -108 mm

spring

11.4°C

-1.4°C vs baseline

441 mm rain · +182 mm

summer

18.0°C

-0.9°C vs baseline

59 mm rain · +43 mm

harvest

17.7°C

+0.5°C vs baseline

100 mm rain · +42 mm

Weather events

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

  1. Dry spell

    Duration
    18 days
    Total rain
    0.8 mm
    Daily cutoff
    1.0 mm/day

  2. Dry spell

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

  3. Dry spell

    Duration
    87 days
    Total rain
    4.4 mm
    Daily cutoff
    1.0 mm/day

  4. Heat episode

    Peak temperature
    33.5°C
    Duration
    4 days
    Heat accumulation
    48 GDD

  5. Concentrated harvest rain

    Total rain
    95.3 mm
    Highest 3-day total
    62.8 mm
    Trigger threshold
    20.0 mm

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

  6. Dry spell

    Duration
    20 days
    Total rain
    0.8 mm
    Daily cutoff
    1.0 mm/day
How events are detected

Weather & Vines combined regional series; method event-timeline-v2-2026-07, rules sonoma-county-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 +47.5 GDD per decade. The 95% interval is +14.2 to +80.8 GDD per decade, based on 35 eligible vintages.

How it is measured: Across the April 1–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
19911393 GDD-102 GDD
19921672 GDD+177 GDD
19931498 GDD+2 GDD
19941420 GDD-75 GDD
19951455 GDD-41 GDD
19961520 GDD+24 GDD
19971591 GDD+96 GDD
19981370 GDD-125 GDD
19991363 GDD-132 GDD
20001447 GDD-48 GDD
20011528 GDD+33 GDD
20021410 GDD-86 GDD
20031518 GDD+23 GDD
20041550 GDD+54 GDD
20051400 GDD-95 GDD
20061487 GDD-9 GDD
20071353 GDD-142 GDD
20081456 GDD-40 GDD
20091408 GDD-87 GDD
20101282 GDD-213 GDD
20111343 GDD-152 GDD
20121394 GDD-101 GDD
20131506 GDD+10 GDD
20141692 GDD+197 GDD
20151689 GDD+193 GDD
20161552 GDD+57 GDD
20171649 GDD+154 GDD
20181501 GDD+5 GDD
20191623 GDD+127 GDD
20201792 GDD+296 GDD
20211583 GDD+88 GDD
20221578 GDD+83 GDD
20231536 GDD+40 GDD
20241685 GDD+190 GDD
20251533 GDD+37 GDD
Growing-season mean temperature
+0.22 °C per decade 95% interval +0.06 to +0.39
Growing degree days
+47.49 GDD per decade 95% interval +14.17 to +80.81
Growing-season precipitation
-11.39 mm per decade 95% interval -28.29 to +5.52
Hot days
+0.71 days per decade 95% interval -0.73 to +2.14
Spring frost days
+0.08 days per decade 95% interval -0.16 to +0.32
Longest dry spell
-4.44 days per decade 95% interval -10.97 to +2.09

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+1.3°C+1.0 to +2.1°C25
2061-2075+1.8°C+1.4 to +2.7°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 27°C 23°C 18°C 19°C 20°C 22°C 23°C 28°C 26°C 24°C
Low 11°C 11°C 11°C 11°C 11°C 12°C 10°C 10°C 11°C 16°C
Rain 0.0 mm 0.0 mm 1.1 mm 1.5 mm 0.0 mm 0.0 mm 0.0 mm 0.0 mm 0.0 mm 14.8 mm

Across the typical year: Late July has the warmest median afternoon high (27.5°C); Late December has the coolest (12.8°C). Wet days are most frequent in Early December (50%) and least frequent in Early August (0%). 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 Sonoma & Mendocino 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. 0°C5°C10°C15°C20°C25°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 Sonoma & Mendocino 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.

Sonoma & Mendocino 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 1–1513.0°C (11.3–14.8°C)3.9°C (1.2–6.1°C)45%70.2 mm (21.5–110.1 mm)
Jan 16–3113.8°C (12.2–16.1°C)4.2°C (1.7–6.6°C)46%92.8 mm (24.9–163.3 mm)
Feb 1–1514.9°C (12.9–18.0°C)4.5°C (2.3–7.2°C)41%62.3 mm (33.4–140.0 mm)
Feb 16–2914.1°C (11.9–17.5°C)4.8°C (2.5–6.4°C)48%89.2 mm (30.2–143.3 mm)
Mar 1–1516.0°C (13.4–19.3°C)5.0°C (2.8–7.2°C)44%71.7 mm (22.2–89.8 mm)
Mar 16–3116.7°C (14.2–19.9°C)5.7°C (3.7–7.4°C)40%41.0 mm (25.6–98.0 mm)
Apr 1–1517.2°C (14.8–19.9°C)5.6°C (3.7–7.4°C)34%33.4 mm (15.6–64.3 mm)
Apr 16–3019.2°C (16.8–22.8°C)6.9°C (5.0–8.2°C)27%20.6 mm (11.8–43.9 mm)
May 1–1520.7°C (18.4–23.7°C)7.7°C (6.3–9.1°C)18%9.8 mm (2.1–25.9 mm)
May 16–3121.8°C (19.5–24.7°C)8.7°C (7.4–9.9°C)18%6.9 mm (1.5–36.7 mm)
Jun 1–1523.8°C (21.5–26.4°C)9.8°C (8.4–10.9°C)8%2.8 mm (0.5–6.1 mm)
Jun 16–3025.8°C (23.8–28.3°C)10.4°C (9.0–11.9°C)6%0.4 mm (0.2–4.2 mm)
Jul 1–1527.2°C (25.4–29.1°C)11.0°C (10.1–12.1°C)0%0.4 mm (0.2–0.5 mm)
Jul 16–3127.5°C (25.3–29.4°C)11.7°C (10.8–12.5°C)1%0.6 mm (0.4–0.9 mm)
Aug 1–1527.4°C (25.5–29.6°C)11.4°C (10.4–12.4°C)0%0.6 mm (0.4–0.8 mm)
Aug 16–3127.4°C (25.5–29.5°C)11.4°C (10.3–12.5°C)1%0.6 mm (0.4–1.1 mm)
Sep 1–1526.7°C (24.5–29.8°C)10.9°C (9.7–12.1°C)2%0.7 mm (0.4–1.0 mm)
Sep 16–3026.4°C (23.6–29.1°C)10.3°C (9.0–11.4°C)6%1.4 mm (0.4–3.7 mm)
Oct 1–1524.1°C (21.2–27.1°C)9.1°C (7.2–10.5°C)12%3.7 mm (0.7–23.9 mm)
Oct 16–3121.7°C (19.0–24.6°C)7.9°C (6.2–9.5°C)20%15.9 mm (1.8–46.9 mm)
Nov 1–1518.1°C (15.9–21.2°C)6.2°C (4.2–8.5°C)30%22.3 mm (11.6–76.6 mm)
Nov 16–3015.3°C (13.7–17.3°C)4.8°C (2.5–7.3°C)40%52.4 mm (28.4–97.6 mm)
Dec 1–1513.7°C (12.1–15.4°C)3.7°C (1.4–7.3°C)50%101.5 mm (35.6–141.8 mm)
Dec 16–3112.8°C (11.1–14.5°C)2.9°C (0.9–5.2°C)42%82.9 mm (20.7–152.7 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

Apr 1–Aug 29, 2026

Growing degree days1070.1base 10°C
Growing-season rainfall118.6 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. 1070 GDD 0 Apr ’26MayJunJulAug
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. 129 mm 0 Apr ’26MayJunJulAug
View growing-season accumulation data
DateSeason GDD1991–2020 average GDDSeason rainfall1991–2020 average rainfall
2026-04-012.22.45.5 mm2.9 mm
2026-04-023.04.68.1 mm4.6 mm
2026-04-036.86.58.1 mm6.6 mm
2026-04-0412.98.28.1 mm9.8 mm
2026-04-0519.69.98.1 mm12.5 mm
2026-04-0623.911.98.2 mm17.2 mm
2026-04-0728.213.98.2 mm22.1 mm
2026-04-0834.015.78.4 mm25.6 mm
2026-04-0939.117.59.2 mm27.3 mm
2026-04-1043.419.617.6 mm29.0 mm
2026-04-1144.621.634.6 mm33.4 mm
2026-04-1245.323.954.0 mm39.2 mm
2026-04-1346.526.257.2 mm42.4 mm
2026-04-1448.128.257.8 mm43.6 mm
2026-04-1549.730.057.9 mm45.0 mm
2026-04-1651.532.358.0 mm48.7 mm
2026-04-1754.035.158.0 mm51.9 mm
2026-04-1857.537.758.0 mm53.3 mm
2026-04-1961.240.658.3 mm55.0 mm
2026-04-2063.143.975.1 mm57.2 mm
2026-04-2164.947.190.5 mm58.7 mm
2026-04-2267.450.798.0 mm60.6 mm
2026-04-2369.954.298.3 mm62.6 mm
2026-04-2473.457.898.6 mm64.7 mm
2026-04-2575.761.298.6 mm67.1 mm
2026-04-2677.464.899.1 mm67.8 mm
2026-04-2780.168.599.7 mm69.3 mm
2026-04-2883.672.499.8 mm70.9 mm
2026-04-2988.376.599.8 mm72.5 mm
2026-04-3094.180.899.8 mm73.1 mm
2026-05-0199.585.299.8 mm75.1 mm
2026-05-02104.589.799.8 mm76.6 mm
2026-05-03108.494.299.8 mm78.1 mm
2026-05-04111.098.4102.2 mm79.5 mm
2026-05-05115.4102.5104.6 mm81.0 mm
2026-05-06121.7106.4104.8 mm81.5 mm
2026-05-07128.1110.9104.8 mm82.5 mm
2026-05-08134.3115.6105.2 mm83.8 mm
2026-05-09140.3119.8105.2 mm84.7 mm
2026-05-10148.0124.2105.4 mm85.2 mm
2026-05-11156.5128.6105.4 mm85.6 mm
2026-05-12163.3132.9105.5 mm86.6 mm
2026-05-13168.8137.2105.5 mm87.4 mm
2026-05-14175.0142.0105.5 mm88.3 mm
2026-05-15181.0147.1105.5 mm90.8 mm
2026-05-16186.8152.0105.5 mm93.5 mm
2026-05-17191.8157.0105.5 mm95.6 mm
2026-05-18199.0162.0105.5 mm99.3 mm
2026-05-19206.9167.0105.5 mm100.8 mm
2026-05-20216.0172.0105.5 mm101.7 mm
2026-05-21224.5177.1105.5 mm103.3 mm
2026-05-22231.6182.6105.5 mm103.6 mm
2026-05-23237.7188.3105.7 mm104.3 mm
2026-05-24243.3193.8105.7 mm104.8 mm
2026-05-25247.1199.3105.8 mm105.9 mm
2026-05-26251.1204.6106.2 mm107.3 mm
2026-05-27255.0210.1106.7 mm108.8 mm
2026-05-28260.6215.7111.1 mm110.3 mm
2026-05-29266.1221.6111.3 mm111.6 mm
2026-05-30271.6227.9111.3 mm112.4 mm
2026-05-31278.6234.7111.3 mm113.1 mm
2026-06-01287.2241.7111.3 mm113.5 mm
2026-06-02294.9248.6111.3 mm113.6 mm
2026-06-03303.5255.5111.3 mm114.4 mm
2026-06-04311.4262.1111.3 mm116.2 mm
2026-06-05319.4268.5111.3 mm116.8 mm
2026-06-06325.7274.4111.3 mm117.1 mm
2026-06-07331.4280.7111.3 mm117.2 mm
2026-06-08336.6287.4112.5 mm118.4 mm
2026-06-09344.2294.6114.7 mm118.9 mm
2026-06-10353.9301.8114.7 mm119.1 mm
2026-06-11367.3309.0114.7 mm119.2 mm
2026-06-12379.2316.3114.7 mm119.3 mm
2026-06-13389.7323.7114.7 mm119.3 mm
2026-06-14399.0331.3114.7 mm119.7 mm
2026-06-15407.9338.6114.8 mm120.0 mm
2026-06-16416.2346.1114.8 mm120.5 mm
2026-06-17424.9353.9114.9 mm120.9 mm
2026-06-18432.8361.8115.0 mm121.1 mm
2026-06-19440.1369.9115.3 mm121.1 mm
2026-06-20447.5378.0115.5 mm121.1 mm
2026-06-21455.8386.2115.5 mm121.2 mm
2026-06-22464.1394.6115.5 mm121.3 mm
2026-06-23472.3402.7115.6 mm121.4 mm
2026-06-24480.3410.9115.6 mm121.5 mm
2026-06-25487.9419.4115.6 mm122.4 mm
2026-06-26495.4428.0115.8 mm122.9 mm
2026-06-27502.9436.8116.1 mm123.5 mm
2026-06-28510.0445.6116.1 mm124.5 mm
2026-06-29519.0454.3116.1 mm125.5 mm
2026-06-30527.1463.5116.1 mm125.8 mm
2026-07-01535.5472.7116.1 mm125.8 mm
2026-07-02543.6481.7116.1 mm125.8 mm
2026-07-03552.6490.8116.1 mm125.9 mm
2026-07-04561.8500.0116.1 mm125.9 mm
2026-07-05570.2508.9116.1 mm125.9 mm
2026-07-06577.8517.9116.2 mm126.0 mm
2026-07-07584.9527.0116.4 mm126.0 mm
2026-07-08592.9536.4116.5 mm126.0 mm
2026-07-09602.3545.8116.6 mm126.1 mm
2026-07-10610.7554.9116.6 mm126.2 mm
2026-07-11619.2564.1116.6 mm126.3 mm
2026-07-12631.2573.3116.6 mm126.3 mm
2026-07-13643.9582.9116.6 mm126.4 mm
2026-07-14656.9592.7116.6 mm126.4 mm
2026-07-15669.2602.3116.6 mm126.4 mm
2026-07-16678.5611.8116.6 mm126.5 mm
2026-07-17686.5621.0116.6 mm126.6 mm
2026-07-18695.2630.6116.7 mm126.7 mm
2026-07-19704.0640.0116.7 mm126.8 mm
2026-07-20714.5649.5116.7 mm126.8 mm
2026-07-21728.4659.0116.9 mm126.9 mm
2026-07-22738.8668.8117.0 mm126.9 mm
2026-07-23748.4678.8117.0 mm126.9 mm
2026-07-24757.8688.6117.0 mm127.0 mm
2026-07-25767.1698.6117.0 mm127.0 mm
2026-07-26777.5708.6117.0 mm127.1 mm
2026-07-27787.7718.7117.0 mm127.1 mm
2026-07-28798.3728.5117.0 mm127.1 mm
2026-07-29808.9738.0117.1 mm127.2 mm
2026-07-30818.6747.7117.1 mm127.2 mm
2026-07-31828.8757.3117.1 mm127.3 mm
2026-08-01840.4767.2117.1 mm127.3 mm
2026-08-02852.6777.0117.1 mm127.4 mm
2026-08-03866.4786.6117.1 mm127.4 mm
2026-08-04878.6795.8117.1 mm127.5 mm
2026-08-05889.2804.7117.2 mm127.5 mm
2026-08-06899.4813.9117.4 mm127.6 mm
2026-08-07910.6823.1117.4 mm127.7 mm
2026-08-08922.3832.7117.4 mm127.7 mm
2026-08-09933.6842.4117.4 mm127.7 mm
2026-08-10944.1852.2117.4 mm127.8 mm
2026-08-11954.0862.1117.5 mm127.9 mm
2026-08-12962.8872.0117.5 mm127.9 mm
2026-08-13971.0882.0117.7 mm127.9 mm
2026-08-14979.1891.9118.0 mm128.0 mm
2026-08-15987.3901.8118.2 mm128.0 mm
2026-08-16996.8911.9118.2 mm128.1 mm
2026-08-171007.8921.5118.2 mm128.2 mm
2026-08-181018.8931.1118.3 mm128.2 mm
2026-08-191029.8940.3118.3 mm128.4 mm
2026-08-201038.9949.3118.4 mm129.1 mm
2026-08-211048.3958.3118.6 mm129.2 mm
2026-08-221058.2967.8118.6 mm129.3 mm
2026-08-231070.1977.4118.6 mm129.3 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
71 GDDvs 95 GDD average
Total rainfall
17.3 mmvs 0.7 mm average

No unusually hot or wet period stands out in the short-range forecast.

Sun8/30 27°Cavg 27°C 11°Cavg 11°C +9 GDD 0.0 mm
Mon8/31 23°Cavg 28°C 11°Cavg 11°C +6 GDD 0.0 mm
Tue9/1 18°Cavg 28°C 11°Cavg 11°C +4 GDD 1.1 mm
Wed9/2 19°Cavg 29°C 11°Cavg 11°C +4 GDD 1.5 mm
Thu9/3 20°Cavg 28°C 11°Cavg 11°C +5 GDD 0.0 mm
Fri9/4 22°Cavg 27°C 12°Cavg 11°C +6 GDD 0.0 mm
Sat9/5 23°Cavg 28°C 10°Cavg 11°C +7 GDD 0.0 mm
Sun9/6 28°Cavg 29°C 10°Cavg 11°C +9 GDD 0.0 mm
Mon9/7 26°Cavg 28°C 11°Cavg 11°C +10 GDD 0.0 mm
Tue9/8 24°Cavg 28°C 16°Cavg 11°C +10 GDD 14.8 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 Sonoma & Mendocino model uses a April 1–October 31 growing season, base 10°C GDD, and an operational hot-day marker of 32°C.

The historical series uses 2 ERA5 locations, 17 temperature stations, and 18 rain stations. Interpretation confidence: high. Geometry confidence: reviewed-approximate. Rules: sonoma-county-catalog-v1-2026-07.