August weather forecast and climate
San Diego, CA

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 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.

What is the warmest month in San Diego?

August is the warmest month in San Diego, with an average high-temperature of 76.5°F (24.7°C) and an average low-temperature of 66.7°F (19.3°C).

What is the temperature in August in San Diego?

In August, the average high-temperature is 76.5°F (24.7°C), and the average low-temperature is 66.7°F (19.3°C).

What is the average humidity in August in San Diego?

In San Diego, California, the average relative humidity in August is 74.1%.

How many days does it rain in August in San Diego?

In San Diego, during August, the rain falls for 0.4 days and regularly aggregates up to 0.1" (2mm) of precipitation.

When is the ocean warmest in San Diego?

The month with the warmest seawater in San Diego, California, is August, with an average ocean temperature of 68°F (20°C). For swimming, a surface water temperature of 68°F (20°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

What is the ocean temperature in August in San Diego?

In August, the average ocean temperature in San Diego is 68°F (20°C). Swimming in 68°F (20°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

What is the average length of the day in August in San Diego?

In San Diego, California, the average length of the day in August is 13.3h.

How many hours of sunshine does San Diego have in August?

The average sunshine in August in San Diego is 9.5h.

What is the month with the highest UV index in San Diego?

Months with the highest UV index in San Diego, California, are June through August, with an average UV index of 10.

What is the UV index reading in August in San Diego?

In San Diego, the average UV index in August is 10.
Average temperature in August - San Diego, CA
  • 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).

  • 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).

Average humidity in August - San Diego, CA
  • 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%).

Average rainfall in August - San Diego, CA
  • 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").

Average rainfall days in August - San Diego, CA
  • 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).

Average sea temperature in August - San Diego, CA
  • 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).

Average daylight in August / Average sunshine in August - San Diego, CA
  • Average daylight in August: 13.3h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • 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).

Average UV index in August - San Diego, CA
  • 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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