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San Diego weather
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The weather guide for San Diego, California shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.
Which is the hottest month in San Diego?
The hottest time of year in San Diego is normally August. Expect maximum daytime temperatures to reach 27°C with moderate heat and humidity.
Which month has the most rain in San Diego?
In terms of rainfall, January is usually the wettest month in San Diego with 53mm on average. There are normally 6 days in January with some rain.
When is it sunniest in San Diego?
The sunniest time of year in San Diego is normally January with bright sunshine on average for 76% of daylight hours; that's 8 hours of sunshine per day.
When is the sea warmest in San Diego?
The sea is usually at its warmest in San Diego in August when the water temperature reaches 20°C.
Metric (°C / mm) | Imperial (°F / inches)
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Compare San Diego weather with the USA
Below the San Diego weather chart shows average maximum daytime temperature for San Diego, California, USA and the USA (Washington).
Maximum daytime temperature (°C)
San Diego, California, USA
USA (Washington)
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Metric (°C / mm) | Imperial (°F / inches)
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Tropical storm risk: San Diego, California hurricane season
% of month affected by tropical storms
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The San Diego, California tropical storm risk chart above shows the hurricane season. The chart was processed from data supplied by the US Meteorological Agency (NOAA). Find out more about our data sources.
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Where's hot in California right now?
Below are the temperatures expected today at popular destinations in California. Select a destination to compare today's forecast with average weather conditions.
- Los Angeles
- Beverly Hills
- Palm Springs
- San Diego
- Santa Barbara
- Death Valley
- Santa Monica
- Napa
- Big Sur
- San Francisco
- Yosemite
- Lake Tahoe
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