San Mateo County weather, town by town
32 places in San Mateo 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 1906 to 2026. Station extremes, not official state records.
San Mateo County Weather Facts
San Mateo County has 32 places on myweatherrock (14 cities, 13 census-designated places, 5 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 110°F at Redwood City on July 14, 1972. The coldest night is 16°F at Redwood City on January 11, 1949. The wettest day brought 5.67 inches of rain at Skyline Ridge Preserve on December 11, 2014. The biggest single-day snow measured 0.39 inches at Boulder Creek 3.6 Ne on December 16, 2008. Those are station measurements from NOAA's daily records, 1906 to 2026, not official state records. By area the largest place is Redwood, about 19 square miles.
About San Mateo County weather
The map on the Now tab shows every San Mateo 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 32 San Mateo County towns with station normals, the warmest month is August, when the day usually reaches 75°F, and the coldest is December, when the night usually falls to 42°F. December is the wettest, with rain on about 11 days. August afternoons run from about 63°F in Broadmoor to 81°F in Atherton. December nights run from about 40°F in Atherton to 45°F in Baywood Park.
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 Mateo County weather records
Measured at the NOAA stations serving these towns, daily records 1906 to 2026. Station extremes, not official state records.
Common questions about San Mateo County weather
- What is the hottest temperature recorded at a San Mateo County station?
- 110°F at Redwood City on July 14, 1972, in the NOAA daily station records myweatherrock holds (1906 to 2026).
- What is the coldest temperature recorded at a San Mateo County station?
- 16°F at Redwood City on January 11, 1949.
- What is the most rain a San Mateo County station has measured in one day?
- 5.67 inches at Skyline Ridge Preserve on December 11, 2014.
- What is the biggest one-day snowfall at a San Mateo County station?
- 0.39 inches at Boulder Creek 3.6 Ne on December 16, 2008.
- How many San Mateo County towns have a weather page here?
- 32: 14 cities, 13 census-designated places, 5 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 San Mateo 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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