Marin County weather, town by town
31 places in Marin 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.
Marin County Weather Facts
Marin County has 31 places on myweatherrock (20 census-designated places, 7 cities, 4 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 115°F at Graton on September 6, 2022. The coldest night is 14°F at Graton on December 22, 1990. The wettest day brought 11.56 inches of rain at Kentfield on January 21, 1967. The biggest single-day snow measured 0 inches at San Francisco 1.6 Se on October 9, 1998. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is San Francisco, about 47 square miles.
About Marin County weather
The map on the Now tab shows every Marin 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 30 Marin County towns with station normals, the warmest month is August, when the day usually reaches 81°F, and the coldest is January, when the night usually falls to 42°F. January is the wettest, with rain on about 11 days. August afternoons run from about 69°F in Sausalito to 84°F in Alto. January nights run from about 36°F in Dillon Beach to 47°F in Sausalito.
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.
Marin 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 Marin County weather
- What is the hottest temperature recorded at a Marin County station?
- 115°F at Graton on September 6, 2022, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Marin County station?
- 14°F at Graton on December 22, 1990.
- What is the most rain a Marin County station has measured in one day?
- 11.56 inches at Kentfield on January 21, 1967.
- What is the biggest one-day snowfall at a Marin County station?
- 0 inches at San Francisco 1.6 Se on October 9, 1998.
- How many Marin County towns have a weather page here?
- 31: 20 census-designated places, 7 cities, 4 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 Marin 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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