San Francisco County · California
San Francisco, CA weather averages
NOAA climate normals for 1991-2020, measured at San Francisco Dwtn, 0.9 km from the city centre — month by month temperature, rain and snow.
Quick answer
San Francisco averages a daily high of 63.9°F and a daily low of 50.8°F across the year, with 23.65 inches of precipitation. September is the warmest month at 70.2°F and January the coldest at 45.7°F.
- Average annual high
- 63.9°FWarmest month September
- Average annual low
- 50.8°FColdest month January
- Precipitation per year
- 23.65 inWettest month December
- Snowfall per year
- —0.1 days at or below 32°F
San Francisco weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 56.9 | 45.7 | 4.5 | — | 45.7 to 56.9 degrees |
| February | 60.2 | 47.5 | 4.46 | — | 47.5 to 60.2 degrees |
| March | 61.8 | 48.5 | 3.26 | — | 48.5 to 61.8 degrees |
| April | 63.1 | 49.2 | 1.46 | — | 49.2 to 63.1 degrees |
| May | 64.3 | 51 | 0.7 | — | 51 to 64.3 degrees |
| June | 66.4 | 52.8 | 0.16 | — | 52.8 to 66.4 degrees |
| July | 66.5 | 54.1 | — | — | 54.1 to 66.5 degrees |
| August | 68.1 | 55.1 | 0.06 | — | 55.1 to 68.1 degrees |
| September | 70.2 | 55.1 | 0.21 | — | 55.1 to 70.2 degrees |
| October | 69.2 | 53.7 | 1.12 | — | 53.7 to 69.2 degrees |
| November | 63.1 | 50.1 | 3.16 | — | 50.1 to 63.1 degrees |
| December | 57.1 | 46.1 | 4.56 | — | 46.1 to 57.1 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00023272, San Francisco Dwtn · rates as published for 1991-2020 normals
How to read San Francisco climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here San Francisco Dwtn, 0.9 km from the centre of San Francisco. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. San Francisco sees about 2.1 days a year at or above 90°F and about 45.9 days with a tenth of an inch of precipitation or more.
Keep going
Other San Francisco data on this site.