San Diego Weather in August
August is the pinnacle of summer weather for San Diego, California. Overall, this is the city's hottest and driest month.
This page gives detailed information on the typical August temperature, precipitation, sun, humidity, wind and storms for San Diego.
The numbers here are historical averages based on climate data gathered at the San Diego International Airport, located on San Diego Bay near the city center.
|76 °F||August average high||25 °C|
|67 °F||August average low||19 °C|
In most years, San Diego averages a daily maximum temperature for August that's between 74 and 79 degrees Fahrenheit (23 to 26 degrees Celsius). The minimum temperature usually falls between 65 and 69 °F (18 to 20 °C).
August is San Diego's hottest month overall, with temperatures peaking on the 27th. That date has daily highs averaging 77.0 °F (25.0 °C) and lows of 66.7 °F (19.3 °C).
|30 days||70 °F max. or more (21 °C)|
|27 days||70 °F min. or less (21 °C)|
Nearly every day in August warms to over 70 °F (21 °C) in San Diego. The city averages 6 days this month when the thermometer reaches into the 80s °F (over 26 °C). Temperatures above 90 °F (32 °C) occur in August about once a decade.
August does not normally get as cold as 60 °F (16 °C).
|0.02 in||total precipitation||0.5 mm|
|0 days||of rain|
August is San Diego's driest month. Most years, San Diego has no rain in August. Just one in every four years receives 0.01 inches (0.3 mm) or more precipitation.
|15 days||clear skies|
The sun's rays reach the ground in San Diego during 70 percent of daylight hours on average in August, for a total of 288 hours in the month. Typically on 15 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in August at San Diego lasts for 13 hours and 18 minutes a day on average. The longest day of the month is the 1st with 13 hours and 44 minutes of daylight. By the end of the month, the days have shortened to 12:51 from sunrise to sunset. These durations can vary by a minute or two from year to year.
|74 %||August average humidity|
The relative humidity in San Diego during August usually peaks at 81 percent in the morning then drops to 64 percent by early afternoon.
|Local Time||1 am||4 am||7 am||10 am||1 pm||4 pm||7 pm||10 pm|
|7.4 mph||August wind speed average||11.9 kph|
August is a little windier than most other months in San Diego.
|0 days||rainfall of 0.5 inches (13 mm) or more|
|0 days||with thunderstorms in August|
San Diego has a thunderstorm during August about once every three or four years.
These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.