San Francisco Weather in August

What's the weather like in San Francisco (California) in August 2025?

The climate in San Francisco during August can be summarized as mild and very dry.

August is in the summer in San Francisco and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 20°C (69°F), whilst at night 13°C (55°F) is normal.

San Francisco weather averages (imperial / metric)
Daytime temperature 20.3°C 68.5°F
Nightly temperature 12.5°C 54.5°F
Average temperature 16.4°C 61.5°F
Daily sunshine 10.2 hrs
Avg rainfall 2 mm 0.1 ins
Rainy days 1 days
Sea temperature 14°C 57.2°F
Humidity 72%
Windspeed 18.7kph 12 mph

On average August is the 2nd driest month of the year in San Francisco with around 2mm 0.1 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.2 hours of sunshine per day.

August temperatures in San Francisco

San Francisco average temperature in August

August rainfall

San Francisco average rain in August

August hourly sunshine

San Francisco average rain in August

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Francisco in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

San Francisco weather stats

San Francisco weather statistics
Hottest month: September 21.4°C 70.5°F
Driest month: July 1mm 0ins
Sunniest month: April 11hrs
Coldest month: January 13.2°C 55.8°F
Wettest month: January 125mm 4.9ins
Map showing location of San Francisco (37.77493, -122.41942) San Francisco map pin © Google

Locations nearby

Top United States locations