San Joaquin County Climate
San Joaquin County, California
Avg Annual Temp
62.5°F
Annual Precip
15.9"
Annual Snowfall
0.0"
Extreme Heat Days
83.875
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About San Joaquin County Weather
Warm and dry in San Joaquin
San Joaquin County averages 62.5°F, making it warmer than the U.S. median. The region is relatively dry, with only 15.9 inches of annual precipitation.
A typical Central Valley profile
The county's 62.5°F average is higher than the California state average of 58.7°F. Its precipitation of 15.9 inches is significantly below the state average of 25.8 inches.
Mirroring the Sacramento climate
San Joaquin is nearly identical to Sacramento County in temperature and rainfall. Both counties experience the same 75.2°F summer average and zero annual snowfall.
Hot summers and foggy winters
There are 84 extreme heat days per year, with July averages reaching 76.6°F. Winters are cool and damp, averaging 47.9°F in January with no recorded snowfall.
Prepare for significant summer heat
Reliable AC is a must for the 84 days of 90-plus degree weather. Residents should also prepare for winter tule fog which often accompanies the cool 49.2°F winter average.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.