San Diego County weather, town by town
55 places in San Diego 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.
San Diego County Weather Facts
San Diego County has 55 places on myweatherrock (37 census-designated places, 18 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 122°F at Borrego Desert Park on June 25, 1990. The coldest night is -1°F at Cuyamaca on February 16, 1903. The wettest day brought 12.81 inches of rain at Cuyamaca on February 16, 1927. The biggest single-day snow measured 35.98 inches at Cuyamaca on February 1, 1922. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is San Diego, about 326 square miles.
About San Diego County weather
The map on the Now tab shows every San Diego 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 55 San Diego County towns with station normals, the warmest month is August, when the day usually reaches 85°F, and the coldest is December, when the night usually falls to 42°F. February is the wettest, with rain on about 7 days. August afternoons run from about 72°F in Camp Pendleton South to 107°F in Borrego Springs. December nights run from about 30°F in Descanso to 49°F in Coronado.
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 Diego 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 San Diego County weather
- What is the hottest temperature recorded at a San Diego County station?
- 122°F at Borrego Desert Park on June 25, 1990, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a San Diego County station?
- -1°F at Cuyamaca on February 16, 1903.
- What is the most rain a San Diego County station has measured in one day?
- 12.81 inches at Cuyamaca on February 16, 1927.
- What is the biggest one-day snowfall at a San Diego County station?
- 35.98 inches at Cuyamaca on February 1, 1922.
- How many San Diego County towns have a weather page here?
- 55: 37 census-designated places, 18 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 Diego 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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