San Francisco County Climate
San Francisco County, California
Avg Annual Temp
56.9°F
Annual Precip
21.8"
Annual Snowfall
0.0"
Extreme Heat Days
2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About San Francisco County Weather
The cool maritime heart of California
San Francisco averages 56.9°F, which is cooler than many parts of the U.S. West Coast. Its 21.8 inches of rain is near the national average but concentrated in winter months.
Cooler than the California average
The county's 56.9°F annual average is lower than the California statewide average of 58.7°F. It is one of the most temperature-stable regions in the state.
The coolest in the region
San Francisco is significantly cooler than San Joaquin County, which averages 62.5°F. It also lacks the extreme heat seen in the nearby Central Valley.
Endless spring and zero snow
The county experiences only 2 extreme heat days per year. With a July average of 59.2°F and a January average of 52.3°F, the temperature rarely fluctuates more than a few degrees.
Layers are the local law
Forget the heavy parka or the tank top; light layers are essential for the constant 50-to-60 degree weather. Air conditioning is rarely needed since temperatures almost never hit 90°F.
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.