San Francisco County weather, town by town
1 place in San Francisco 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 1945 to 2025. Station extremes, not official state records.
San Francisco County Weather Facts
San Francisco County has 1 place on myweatherrock (1 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 106°F at San Francisco Intl Ap on June 14, 1961. The coldest night is 24°F at San Francisco Intl Ap on December 9, 1972. The wettest day brought 5.59 inches of rain at San Francisco Intl Ap on January 4, 1982. 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, 1945 to 2025, not official state records. By area the largest place is South San Francisco, about 9 square miles.
About San Francisco County weather
The map on the Now tab shows every San Francisco 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 1 San Francisco County towns with station normals, the warmest month is September, when the day usually reaches 74°F, and the coldest is January, when the night usually falls to 45°F. January is the wettest, with rain on about 11 days.
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.
San Francisco County weather records
Measured at the NOAA stations serving these towns, daily records 1945 to 2025. Station extremes, not official state records.
Common questions about San Francisco County weather
- What is the hottest temperature recorded at a San Francisco County station?
- 106°F at San Francisco Intl Ap on June 14, 1961, in the NOAA daily station records myweatherrock holds (1945 to 2025).
- What is the coldest temperature recorded at a San Francisco County station?
- 24°F at San Francisco Intl Ap on December 9, 1972.
- What is the most rain a San Francisco County station has measured in one day?
- 5.59 inches at San Francisco Intl Ap on January 4, 1982.
- What is the biggest one-day snowfall at a San Francisco County station?
- 0 inches at San Francisco 1.6 Se on October 9, 1998.
- How many San Francisco County towns have a weather page here?
- 1: 1 cities. 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 San Francisco 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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