San Francisco Weather & Climate: Best Time to Visit

The climate in San Francisco remains fairly constant, offering comfortable temperatures throughout the year. Average maximum daytime temperatures range from a very warm 31°C (88°F) in August, the warmest time of the year, to a comfortable 26°C (79°F) during cooler months like February.

At night, you can expect temperatures ranging from 27°C (81°F) in August to around 21°C (70°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

San Francisco is known for its substantial rainfall, with annual precipitation reaching 1002 mm (39 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, September it receives heavy rainfall, averaging 254 mm (10 in) of precipitation, recorded across 18 rainy days. In contrast, the driest month April brings less rainfall, with 2.4 mm (0.1 in) over a single rainy day. For more details, please visit our San Francisco Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

The relative humidity is high throughout the year in San Francisco.

The city experiences its highest humidity in August, reaching 70%. In February, the humidity drops to its lowest level at 65%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year