Mendocino County Climate
Mendocino County, California
Avg Annual Temp
56.4°F
Annual Precip
42.7"
Annual Snowfall
1.2"
Extreme Heat Days
54.38333333333333
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mendocino County Weather
Comfortable and temperate coastal air
Mendocino County's 56.4°F annual average is slightly higher than the national median. It offers a stable, maritime-influenced climate that avoids the harshness of continental weather.
Slightly cooler than the state average
Mendocino's 56.4°F average is just below the California state average of 58.7°F. This makes it a temperate middle ground between the cold north and the hot south.
One of California's wettest regions
The county receives 42.7 inches of annual precipitation, dwarfing the state average of 25.8 inches. This heavy rainfall is paired with minimal snowfall, averaging only 1.2 inches per year.
Fifty-four days of summer heat
The July average reaches 69.7°F, but the county still experiences 54 days of extreme heat over 90°F. Winter remains mild with an average of 45.9°F, providing a relatively narrow temperature range.
Invest in serious rain gear
The 42.7 inches of annual rain define the lifestyle here, making waterproof clothing and sturdy roofing essential. Residents should also be prepared for the 54 days of extreme heat that occur mostly inland.
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.