Best time to visit San Francisco

Usually the most comfortable: July, August and September. Typical weather over 2001–2020, not a forecast.

1. January: cool, high 13°, low 6°, about 100 mm of rain, comfort 69 out of 100
   JJan
2. February: cool, high 14°, low 7°, about 102 mm of rain, comfort 70 out of 100
   FFeb
3. March: cool, high 15°, low 8°, about 82 mm of rain, comfort 79 out of 100
   MMar
4. April: cool, high 17°, low 8°, about 42 mm of rain, comfort 88 out of 100
   AApr
5. May: pleasant, high 19°, low 9°, about 18 mm of rain, comfort 96 out of 100
   MMay
6. June: pleasant, high 21°, low 11°, about 6 mm of rain, comfort 100 out of 100
   JJun
7. July: pleasant, high 22°, low 12°, about 1 mm of rain, comfort 100 out of 100
   JJul
8. August: pleasant, high 23°, low 12°, about 1 mm of rain, comfort 100 out of 100
   AAug
9. September: pleasant, high 23°, low 12°, about 4 mm of rain, comfort 100 out of 100
   SSep
10. October: pleasant, high 21°, low 11°, about 29 mm of rain, comfort 100 out of 100
    OOct
11. November: cool, high 17°, low 8°, about 62 mm of rain, comfort 85 out of 100
    NNov
12. December: wet, high 13°, low 6°, about 138 mm of rain, comfort 64 out of 100
    DDec

Taller is more comfortable. The brighter bars are the best months; the filled label is this month.

Comfort uses the typical daytime high (most comfortable at 20 to 28°C) and the typical rainfall (most comfortable under 1 mm a day), averaged over 2001–2020. Highs and lows are worked out from the monthly average temperature and the average daily swing, so they are close, not exact. It is not a forecast. Humidity, crowds, prices and festivals are not included, and a mountain or coast can differ from its half-degree grid cell.