San Luis Obispo County Climate
San Luis Obispo County, California
Avg Annual Temp
59.8°F
Annual Precip
20.7"
Annual Snowfall
0.0"
Extreme Heat Days
32.17142857142857
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About San Luis Obispo County Weather
San Luis Obispo's temperate coast
San Luis Obispo County averages 59.8°F, offering a mild climate slightly above the national median. It receives 20.7 inches of rain, mostly during the winter season.
Matching the California climate norm
The county's 59.8°F average is remarkably close to the California state average of 58.7°F. Its rainfall of 20.7 inches is slightly drier than the state average of 25.8 inches.
More moderate than inland neighbors
San Luis Obispo is cooler and wetter than San Benito County. While it only averages 32 heat days, San Benito experiences 54, showing the cooling influence of the Pacific.
Mild summers and no snow
The county sees just 32 extreme heat days a year, with July averaging 66.8°F. Winters are very mild, with a January average of 52.4°F and zero inches of snowfall.
Embrace the coastal mildness
Mild clothing works year-round for the 52-to-66 degree range. While 32 heat days occur, the primary concern for residents is managing the 20.7 inches of winter rain.
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.