San Diego County Climate
San Diego County, California
Avg Annual Temp
62.6°F
Annual Precip
14.0"
Annual Snowfall
3.8"
Extreme Heat Days
42.51428571428571
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About San Diego County Weather
Mild Mediterranean comfort in San Diego
San Diego County averages 62.6°F annually, offering a temperate climate warmer than the national median. It receives 14 inches of rain, characteristic of a semi-arid coastal region.
Consistently warmer than state average
At 62.6°F, the county is warmer than the California average of 58.7°F. Its rainfall is roughly half of the state average, reflecting the dry nature of Southern California.
More moderate than the interior
San Diego is much cooler than neighboring Riverside County, which averages 69.5°F. It also receives nearly double the annual rainfall of its inland neighbors to the north and east.
Stable temperatures year-round
The county only experiences 43 extreme heat days, far fewer than the 140 seen in Riverside. January averages 53.5°F and July averages 73.3°F, showing very little seasonal variation.
Focus on sun and drought
With 43 days of heat over 90°F, moderate cooling is usually sufficient. Water-wise landscaping is critical given the modest 14 inches of annual precipitation.
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.