Alameda County Climate
Alameda County, California
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
59.9°F
Annual Precip
18.1"
Annual Snowfall
0.0"
Extreme Heat Days
26
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
10a
Minimum winter temperature range for plant survival
3,785
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Alameda County
Climate Verdict
Alameda County has a mild, with an average annual temperature of 59.9°F, semi-arid conditions with only 18.1 inches of annual precipitation, occasional hot days — 26.488888888888887 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 50.0°F. summers are pleasantly cool with July averaging 68.3°F. The climate is remarkably stable year-round, with only a 18°F difference between January and July. January 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
Alameda County closely matches the California statewide average temperature of 58.7°F, it is also noticeably drier, receiving 7.7 inches less precipitation than the state average, the county experiences 32.18203607404499 fewer extreme heat days than the state average.
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 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.