San Francisco, California, United States climate
Average temperatures, precipitation and all-time records for San Francisco, California, United States, with every day graded against ~46 years of local climate history (1980–2026). Its warmest month is September, averaging a high of 67°F, and its coldest is January, with an average low of 47°F.
San Francisco, officially the City and County of San Francisco, is the fourth-most populous city in California and the 17th-most populous in the United States, with a population of 826,079 in 2025. Among U.S. via Wikipedia
San Francisco average temperatures by month
Typical daily high and low, and average precipitation, for each month in San Francisco, California, United States, based on 1980–2026 records. The wettest month is February (0.20 in on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | 56°F | 47°F | 0.10 in |
| February | 58°F | 48°F | 0.20 in |
| March | 59°F | 49°F | 0.10 in |
| April | 60°F | 50°F | 0.10 in |
| May | 62°F | 52°F | 0.00 in |
| June | 65°F | 54°F | 0.00 in |
| July | 65°F | 55°F | 0.00 in |
| August | 66°F | 56°F | 0.00 in |
| September | 67°F | 56°F | 0.00 in |
| October | 66°F | 55°F | 0.00 in |
| November | 60°F | 51°F | 0.10 in |
| December | 56°F | 47°F | 0.10 in |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.
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Record extremes
- Hottest day on record: 95°F on 2017-09-01
- Coldest day on record: 27°F on 1990-12-22
Percentiles compare each day to San Francisco, California, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →