Sonoma County weather, town by town
38 places in Sonoma County, California, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Sonoma County Weather Facts
Sonoma County has 38 places on myweatherrock (29 census-designated places, 8 cities, 1 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 117°F at Healdsburg on September 6, 2022. The coldest night is 9°F at Santa Rosa on December 25, 1924. The wettest day brought 8.81 inches of rain at Ft Ross on November 18, 1920. The biggest single-day snow measured 1.5 inches at Fairfield on December 27, 1988. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Santa Rosa, about 43 square miles.
About Sonoma County weather
The map on the Now tab shows every Sonoma County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 38 Sonoma County towns with station normals, the warmest month is August, when the day usually reaches 83°F, and the coldest is December, when the night usually falls to 38°F. January is the wettest, with rain on about 12 days. August afternoons run from about 68°F in Cazadero to 93°F in Cloverdale. December nights run from about 36°F in Bloomfield to 41°F in Cazadero.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
Sonoma County weather records
Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Common questions about Sonoma County weather
- What is the hottest temperature recorded at a Sonoma County station?
- 117°F at Healdsburg on September 6, 2022, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Sonoma County station?
- 9°F at Santa Rosa on December 25, 1924.
- What is the most rain a Sonoma County station has measured in one day?
- 8.81 inches at Ft Ross on November 18, 1920.
- What is the biggest one-day snowfall at a Sonoma County station?
- 1.5 inches at Fairfield on December 27, 1988.
- How many Sonoma County towns have a weather page here?
- 38: 29 census-designated places, 8 cities, 1 towns. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the Sonoma County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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