San Joaquin County Climate
San Joaquin County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
62.5°F
Annual Precip
15.9"
Annual Snowfall
0.0"
Extreme Heat Days
84
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9b
Minimum winter temperature range for plant survival
4,856
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: San Joaquin County
Climate Verdict
San Joaquin County has a warm, averaging 62.5°F year-round, semi-arid conditions with only 15.9 inches of annual precipitation, significant summer heat with 83.875 days annually above 90°F, virtually no measurable snowfall. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 47.9°F. summers are warm — July averages 76.6°F. The climate is remarkably stable year-round, with only a 29°F difference between January and July. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
San Joaquin County is 3.9°F warmer than the California statewide average of 58.7°F, it is also noticeably drier, receiving 9.8 inches less precipitation than the state average, the county experiences 25.204075037066126 more extreme heat days than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.