Marin County Climate
Marin County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
59.4°F
Annual Precip
38.4"
Annual Snowfall
0.0"
Extreme Heat Days
23
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
10a
Minimum winter temperature range for plant survival
3,615
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Marin County
Climate Verdict
Marin County has a mild, with an average annual temperature of 59.4°F, moderate rainfall of 38.4 inches per year, occasional hot days — 23.45 per year above 90°F, virtually no measurable snowfall. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 49.5°F. summers are pleasantly cool with July averaging 67.9°F. The climate is remarkably stable year-round, with only a 18°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
Marin County closely matches the California statewide average temperature of 58.7°F, it is also noticeably wetter, receiving 12.6 inches more precipitation than the state average, the county experiences 35.22092496293388 fewer extreme heat days than the state average.
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 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.