Alameda County Climate
Alameda County, California
Avg Annual Temp
59.9°F
Annual Precip
18.1"
Annual Snowfall
0.0"
Extreme Heat Days
26.488888888888887
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Alameda County Weather
Warmer and Milder Than the National Median
Alameda County averages 59.9°F annually, placing it well above the median temperature for the United States. Its classic Mediterranean climate offers consistently warmer conditions than most of the country.
Slightly Warmer Than the California Average
The county's 59.9°F average temperature exceeds California's state average of 58.7°F. While it stays warm, it receives only 18.1 inches of rain, which is lower than the state's 25.8-inch average.
Cooler than Inland Neighbors
Alameda is slightly cooler than neighboring Contra Costa County, which averages 60.4°F. However, it remains significantly warmer and drier than Northern California coastal counties like Del Norte.
Moderate Summers with Rare Winter Frost
July averages 68.3°F, though the county still sees 26 extreme heat days per year. Winters are mild with a 50.9°F average and zero recorded snowfall.
Prepare for Heatwaves and Low Rainfall
Residents should maintain efficient cooling systems for the 26 days of extreme heat. With only 18.1 inches of rain, drought-resistant landscaping is a practical choice for local homes.
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.