Marin County Climate
Marin County, California
Avg Annual Temp
59.4°F
Annual Precip
38.4"
Annual Snowfall
0.0"
Extreme Heat Days
23.45
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Marin County Weather
Temperate and mild coastal climate
Marin County averages 59.4°F annually, making it warmer than the national median but famously stable. Its proximity to the Pacific Ocean prevents the extreme temperature swings found in the interior.
Right in the California sweet spot
Marin's 59.4°F average is nearly identical to the California state average of 58.7°F. It represents the classic Northern California coastal profile: mild, foggy, and consistent.
A rain-soaked coastal neighbor
Marin is much wetter than the state average, receiving 38.4 inches of rain compared to the California norm of 25.8 inches. This high precipitation supports its famous redwood forests and green hills.
Few extreme heat days annually
Summers are cool with a July average of 67.9°F and only 23 days of heat over 90°F. Snow is non-existent at 0.0 inches, while winters stay mild with a January average of 49.5°F.
Pack layers and prepare for rain
The 38.4 inches of rain require high-quality waterproof gear and well-maintained drainage systems. With only 23 heat days, many residents rely on coastal breezes rather than heavy air conditioning.
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.