Alameda County weather, town by town
20 places in Alameda 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.
Alameda County Weather Facts
Alameda County has 20 places on myweatherrock (14 cities, 6 census-designated places), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 116°F at Livermore on September 5, 2022. The coldest night is 18°F at Livermore on January 5, 1961. The wettest day brought 6.83 inches of rain at Richmond on January 4, 1982. The biggest single-day snow measured 7.99 inches at Mt Diablo Junction on March 14, 1975. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Fremont, about 78 square miles.
About Alameda County weather
The map on the Now tab shows every Alameda 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 20 Alameda County towns with station normals, the warmest month is September, when the day usually reaches 78°F, and the coldest is January, when the night usually falls to 42°F. December is the wettest, with rain on about 10 days. September afternoons run from about 75°F in Alameda to 86°F in Dublin. January nights run from about 38°F in Dublin to 45°F in Oakland.
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.
Alameda 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 Alameda County weather
- What is the hottest temperature recorded at a Alameda County station?
- 116°F at Livermore on September 5, 2022, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Alameda County station?
- 18°F at Livermore on January 5, 1961.
- What is the most rain a Alameda County station has measured in one day?
- 6.83 inches at Richmond on January 4, 1982.
- What is the biggest one-day snowfall at a Alameda County station?
- 7.99 inches at Mt Diablo Junction on March 14, 1975.
- How many Alameda County towns have a weather page here?
- 20: 14 cities, 6 census-designated places. 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 Alameda 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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