San Joaquin County weather, town by town
28 places in San Joaquin 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 Joaquin County Weather Facts
San Joaquin County has 28 places on myweatherrock (21 census-designated places, 7 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 115°F at Stockton Ap on July 23, 2006. The coldest night is 16°F at Stockton Ap on January 11, 1949. The wettest day brought 4.75 inches of rain at Acampo 5Ne on October 25, 2021. The biggest single-day snow measured 1.5 inches at Modesto Ap on January 21, 1962. Those are station measurements from NOAA's daily records, 1906 to 2026, not official state records. By area the largest place is Stockton, about 63 square miles.
About San Joaquin County weather
The map on the Now tab shows every San Joaquin 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 28 San Joaquin County towns with station normals, the warmest month is July, when the day usually reaches 94°F, and the coldest is December, when the night usually falls to 38°F. January is the wettest, with rain on about 10 days. July afternoons run from about 92°F in Thornton to 95°F in Escalon. December nights run from about 36°F in Tracy to 40°F in Mountain House.
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 Joaquin 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 Joaquin County weather
- What is the hottest temperature recorded at a San Joaquin County station?
- 115°F at Stockton Ap on July 23, 2006, in the NOAA daily station records myweatherrock holds (1906 to 2026).
- What is the coldest temperature recorded at a San Joaquin County station?
- 16°F at Stockton Ap on January 11, 1949.
- What is the most rain a San Joaquin County station has measured in one day?
- 4.75 inches at Acampo 5Ne on October 25, 2021.
- What is the biggest one-day snowfall at a San Joaquin County station?
- 1.5 inches at Modesto Ap on January 21, 1962.
- How many San Joaquin County towns have a weather page here?
- 28: 21 census-designated places, 7 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 Joaquin 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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