San Francisco climate at a glance
San Francisco sees average daytime highs ranging from 14°C in December to 21°C in September. Around 633 mm of precipitation falls over roughly 59 wet days a year, peaking in December (179 mm) and easing off in July (0 mm). June is the sunniest month at about 13 hours of sunshine.
San Francisco temperature & rainfall by month
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Weather seasons in San Francisco
Grouped by the monthly travel score — purely weather-based, not crowd or price data.
San Francisco climate, month by month
Averages computed from ERA5 reanalysis data, 2019–2024. Daylight on the 15th: 14 h in May. Reuse this data freely with attribution — download as JSON or CSV.
| Month | High | Low | Rain days | Rainfall | Sun/day | Humidity | Score |
|---|---|---|---|---|---|---|---|
| January | 14°C | 8°C | 10.5 | 118 mm | 6.9 h | 83% | 6.3 · Fair |
| February | 14°C | 8°C | 8.2 | 94 mm | 8.8 h | 77% | 7.4 · Good |
| March | 14°C | 9°C | 10.7 | 98 mm | 9.3 h | 78% | 6.8 · Fair |
| April | 16°C | 10°C | 3.5 | 23 mm | 11.5 h | 79% | 9.4 · Excellent |
| May | 17°C | 11°C | 3.3 | 25 mm | 12.6 h | 77% | 10.0 · Excellent |
| June | 19°C | 13°C | 0.2 | 2 mm | 13.2 h | 77% | 10.0 · Excellent |
| July | 19°C | 13°C | 0 | 0 mm | 12.9 h | 81% | 10.0 · Excellent |
| August | 20°C | 14°C | 0.3 | 1 mm | 12.2 h | 81% | 10.0 · Excellent |
| September | 21°C | 14°C | 1.3 | 5 mm | 11.3 h | 80% | 10.0 · Excellent |
| October | 21°C | 13°C | 2.2 | 30 mm | 9.8 h | 72% | 10.0 · Excellent |
| November | 16°C | 10°C | 6.3 | 59 mm | 8.5 h | 76% | 9.0 · Excellent |
| December | 14°C | 8°C | 12.5 | 179 mm | 6.3 h | 84% | 5.7 · Fair |
Frequently asked questions
What is the best time to visit San Francisco?
The best time to visit San Francisco is April–October, when daytime highs average around 17°C with about 3.3 rainy days per month.
What is the hottest month in San Francisco?
September is the hottest month in San Francisco, with average highs of 21°C.
What is the rainiest month in San Francisco?
December is the rainiest month in San Francisco, with around 179 mm of rainfall over 12.5 rainy days.
Where should you go next month?
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