Best Time to Visit San Francisco
The best time to visit San Francisco is July to October, when the average temperature is 15–16°C and rainfall is low for San Francisco, at 2–26 mm a month.
San Francisco weather by month
The wettest month in San Francisco is December with 115 mm of rain, and the warmest is September at an average 16°C. The coolest is January at 11°C.
| Month | Average temperature | Rainfall | Verdict |
|---|---|---|---|
| January | 11°C / 51°F | 88 mm | Cool |
| February | 11°C / 52°F | 88 mm | Cool |
| March | 12°C / 53°F | 74 mm | Cool |
| April | 12°C / 53°F | 38 mm | Cool |
| May | 13°C / 55°F | 17 mm | Cool |
| June | 14°C / 57°F | 6 mm | Cool |
| July | 15°C / 59°F | 2 mm | Best |
| August | 16°C / 60°F | 2 mm | Best |
| September | 16°C / 61°F | 4 mm | Best |
| October | 15°C / 59°F | 26 mm | Best |
| November | 13°C / 55°F | 55 mm | Cool |
| December | 11°C / 52°F | 115 mm | Cool |
How we pick the best months
- Best: an average temperature of 15–28°C and low rainfall for San Francisco: under 150 mm, and no more than 60 mm, a quarter above San Francisco's median month (never set below 60 mm).
- If no month qualifies, we show the three driest months that average 10–30°C instead.
- Wet: 150 mm of rain or more. Rainy: more than 60 mm. Hot: 29°C or more on average. Cool: under 15°C. Cold: under 5°C.
Averages cover day and night, so afternoons are warmer than the figure shown. Weather is only one reason to pick a month: school holidays, festivals and prices matter too.
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Where these numbers come from
Monthly averages for January 2001 – December 2020 from the NASA POWER project, for the area around SFO (SFO) at 37.62, -122.38. The model covers a grid about 50 km across, so a coastal or hilly spot can run a degree or two different. Retrieved 12 September 2026.
The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) Prediction of Worldwide Energy Resource (POWER) Project funded through the NASA Earth Science/Applied Science Program.