September and October. September and October offer San Francisco's warmest and driest weather (highs 67–72°F), reduced summer fog, and fewer crowds than peak summer. Fall is consistently cited by travel experts as the optimal visiting period for outdoor exploration
| Month | High (°F) | Low (°F) | Notes |
|---|---|---|---|
| Jan | 57 | 44 | cool & changeable |
| Feb | 59 | 45 | cool & mostly dry |
| Mar | 60 | 47 | mild & changeable |
| Apr | 62 | 49 | mild & mostly dry |
| May | 65 | 51 | mild & sunny |
| Jun | 69 | 54 | mild & sunny |
| Jul | 69 | 55 | mild & sunny |
| Aug | 70 | 57 | mild & sunny |
| Sep | 72 | 56 | warm & sunny |
| Oct | 69 | 54 | mild & sunny |
| Nov | 63 | 49 | mild & mostly dry |
| Dec | 57 | 45 | cool & changeable |