Sonoma County Climate
Sonoma County, California
Avg Annual Temp
57.9°F
Annual Precip
36.6"
Annual Snowfall
0.0"
Extreme Heat Days
31.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sonoma County Weather
Warmer than the national median
Sonoma County’s 57.9°F average temperature sits well above the U.S. national median, characterizing its stable Mediterranean climate. This temperate environment avoids the harsh winter extremes found in much of the country. It offers a mild, consistent warmth that defines the region.
Mirroring the California average
At 57.9°F, Sonoma is nearly identical to the California state average of 58.7°F. While many inland counties bake, Sonoma remains one of the state's more moderate locales. It serves as a benchmark for the balanced coastal-inland weather profile.
A lush, wet neighbor
The county receives 36.6 inches of rain annually, far exceeding the state average of 25.8 inches. This makes it significantly wetter than Central Valley neighbors like Stanislaus, which sees only 12.3 inches. The moisture supports the region's famous greenery and agricultural diversity.
Mild winters and sunny summers
Summer temperatures average 65.7°F, but the county still faces 32 extreme heat days over 90°F annually. Winters are gentle at 49.3°F with no recorded snowfall. This combination allows for year-round outdoor activity without specialized winter gear.
Prepare for wet winters
Residents should invest in high-quality rain gear to handle the 36.6 inches of annual precipitation. While summers are moderate, air conditioning is necessary to manage the month’s worth of extreme heat days. Home maintenance should prioritize drainage to handle the heavy seasonal rainfall.
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.