San Francisco weather by month

San Francisco runs from an average daily high of 58°F in January to 75°F in September, with overnight lows between 44°F (January) and 56°F (August).

December is the wettest month (4.1 inches) and July the driest (0.0 inches); about 20 inches fall in a normal year.

By a simple rule (average highs of 65-88°F, lows of 40°F or more and rain at or under the yearly average), the comfortable months for San Francisco day trips are Apr-Oct.

Month by month in San Francisco

Month	Average high	Average low	Rain (in)	Day trips open
January	58°F	44°F	3.9	150 of 150
February	61°F	46°F	4.0	150 of 150
March	63°F	48°F	2.7	150 of 150
April best	66°F	49°F	1.4	150 of 150
May best	68°F	52°F	0.5	150 of 150
June best	72°F	54°F	0.1	150 of 150
July best	73°F	55°F	0.0	150 of 150
August best	73°F	56°F	0.0	150 of 150
September best	75°F	56°F	0.1	150 of 150
October best	72°F	53°F	0.8	150 of 150
November	64°F	48°F	2.0	150 of 150
December	58°F	45°F	4.1	150 of 150

The numbers are from NOAA's station at San Francisco Intl Airport, Ca (USW00023234). Climate normals 1991-2020: long-run averages, not a forecast. "Day trips open" counts the places within 3 hours that are open or in season on the 15th, from our own place data.

Questions about San Francisco weather

What is the best time to visit San Francisco?

By a simple rule (average highs of 65-88°F, lows of 40°F or more and rain at or under the yearly average), the comfortable months for San Francisco day trips are Apr-Oct.

What is the hottest and coldest month in San Francisco?

September is the hottest (average high 75°F) and January the coolest (average low 44°F).

When does it rain the most in San Francisco?

December is the wettest month (4.1 inches) and July the driest (0.0 inches).

Does it snow in San Francisco?

The station does not record snowfall as a normal; check the forecast for mountain areas.

Where do these weather numbers come from?

The numbers are from NOAA's station at San Francisco Intl Airport, Ca (USW00023234). They are 1991-2020 climate normals (long-run averages), not a forecast. For today's weather use the National Weather Service forecast.