San Diego County Climate
San Diego County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
62.6°F
Annual Precip
14.0"
Annual Snowfall
3.8"
Extreme Heat Days
43
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
10b
Minimum winter temperature range for plant survival
4,851
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: San Diego County
Climate Verdict
San Diego County has a warm, averaging 62.6°F year-round, arid conditions receiving just 14.0 inches of precipitation annually, occasional hot days — 42.51428571428571 per year above 90°F, light snow averaging 3.8 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 53.5°F. summers are warm — July averages 73.3°F. The climate is remarkably stable year-round, with only a 20°F difference between January and July. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
San Diego County is 4.0°F warmer than the California statewide average of 58.7°F, it is also noticeably drier, receiving 11.8 inches less precipitation than the state average, the county experiences 16.156639248648162 fewer extreme heat days than the state average.
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 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.