August weather forecastSan Diego, CA
August
Weather in August
In August, the summery ambiance continues in San Diego. With the highest average high temperature of 77.4°F (25.2°C), the city revels in peak summer. The month starts with an upswing in sea temperatures while the extended daylight hours encourage outdoor activities. Despite being one of the driest months with rainfall averaging at 0.39" (10mm), the slightly higher humidity keeps the air feeling a touch heavy. The warm nights accompanied by gentle sea breezes create the perfect conditions for balmy, moonlit beach walks.Temperature
August stands out as San Diego's warmest month, with temperatures ranging between an average high of 77.4°F (25.2°C) and a low of 65.7°F (18.7°C).Humidity
In San Diego, the average relative humidity in August is 70%.Rainfall
In San Diego, California, during August, the rain falls for 3.8 days and regularly aggregates up to 0.39" (10mm) of precipitation. In San Diego, during the entire year, the rain falls for 61.8 days and collects up to 8.7" (221mm) of precipitation.Ocean temperature
The month with the warmest seawater in San Diego is August, with an average ocean temperature of 68°F (20°C).Note: Most individuals do not find swimming at 68°F (20°C) to be enjoyable. As the water temperature declines below 69.8°F (21°C), maintaining control over one's breathing becomes harder.
Daylight
In August, the average length of the day in San Diego is 13h and 19min.On the first day of the month, sunrise is at 6:03 am and sunset at 7:46 pm. On the last day of August, sunrise is at 6:23 am and sunset at 7:14 pm PDT.
Sunshine
The months with the most sunshine in San Diego are July and August, with an average of 11.9h of sunshine.UV index
July through September, with an average maximum UV index of 6, are months with the highest UV index in San Diego. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 6 in August translates into these instructions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
San Diego, CA
- Average high temperature in August: 77.4°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is February (63.1°F).
- Average low temperature in August: 65.7°F
The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).
Average pressure in August
San Diego, CA
- Average pressure in August: 29.89"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
Average wind speed in August
San Diego, CA
- Average wind speed in August: 5.6mph
The windiest months (with the highest average wind speed) are April and May (6.3mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).
Average humidity in August
San Diego, CA
- Average humidity in August: 70%
The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (59%).
Average rainfall in August
San Diego, CA
- Average rainfall in August: 0.39"
The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in August
San Diego, CA
- Average rainfall days in August: 3.8 days
The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (2.7 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: 13h and 18min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in August: 11h and 54min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in August
San Diego, CA
- Average sunshine days in August: 21.8 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is July (20.3 days).
Average UV index in August
San Diego, CA
- Average UV index in August: 6
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in August
San Diego, CA
- Average cloud cover in August: 9
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 9).
Average visibility in August
San Diego, CA
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
