San Diego
California, USA
Long-term weather forecast
Long-term weather forecast
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August weather forecast and Climate
San Diego, CA

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The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
August is usually the warmest month in San Diego with the highest average low and high temperatures of the year at 67°F (19.4°C) and 76°F (24.4°C) respectively.
It is bone dry with long and hot days with daily sunshine of 9.5 hours. The seawater temperatures along the San Diego coast are around 68°F (20°C), which is an open invitation for swimming in the warm and clear waters.
Be careful though, as the tourist season is at the peak, there are crowds everywhere, and the beaches are swarming with visitors. August mornings are usually cloudy.
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  • The average high temperature in August: 76.4°F

The warmest month (with the highest average high temperature) is August (76.4°F).
The month with the lowest average high temperature is December (64.7°F).

  • The average low temperature in August: 66.7°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is December (48.4°F).

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  • The average humidity in August: 74.1%

The month with the highest relative humidity is July (74.6%).
The month with the lowest relative humidity is January (63.1%).

  • The average rainfall in August: 0.1"

The wettest month (with the highest rainfall) is January (2.1").
The driest month (with the lowest rainfall) is July (0").

  • The average rainfall days in August: 0.4 days

The month with the highest number of rainy days is February (7.1 days).
The month with the lowest number of rainy days is August (0.4 days).

  • The average sea temperature in August: 67.9°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

  • The average daylight in August: 13h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in August: 9.5h

The month with most sunshine is July (Average sunshine: 9.8h).
The month with least sunshine is December (Average sunshine: 7.5h).

  • The average UV index in August: 10

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).

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