Sierra County weather, town by town
11 places in Sierra 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 1896 to 2026. Station extremes, not official state records.
Sierra County Weather Facts
Sierra County has 11 places on myweatherrock (10 census-designated places, 1 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 109°F at Downieville on August 7, 1981. The coldest night is -34°F at Sierraville Rs on January 20, 1937. The wettest day brought 11.75 inches of rain at Strawberry Valley 2 on January 31, 1963. The biggest single-day snow measured 47.99 inches at Bowman Dam on February 8, 1909. Those are station measurements from NOAA's daily records, 1896 to 2026, not official state records. By area the largest place is Sierraville, about 5 square miles.
About Sierra County weather
The map on the Now tab shows every Sierra 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 11 Sierra County towns with station normals, the warmest month is July, when the day usually reaches 85°F, and the coldest is December, when the night usually falls to 23°F. March is the wettest, with rain on about 9 days. July afternoons run from about 74°F in Verdi to 90°F in Alleghany. December nights run from about 18°F in Calpine to 30°F in Alleghany.
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.
Sierra County weather records
Measured at the NOAA stations serving these towns, daily records 1896 to 2026. Station extremes, not official state records.
Common questions about Sierra County weather
- What is the hottest temperature recorded at a Sierra County station?
- 109°F at Downieville on August 7, 1981, in the NOAA daily station records myweatherrock holds (1896 to 2026).
- What is the coldest temperature recorded at a Sierra County station?
- -34°F at Sierraville Rs on January 20, 1937.
- What is the most rain a Sierra County station has measured in one day?
- 11.75 inches at Strawberry Valley 2 on January 31, 1963.
- What is the biggest one-day snowfall at a Sierra County station?
- 47.99 inches at Bowman Dam on February 8, 1909.
- How many Sierra County towns have a weather page here?
- 11: 10 census-designated places, 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 Sierra 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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