San Francisco Climate by Month
San Francisco, California, United States
Mild summers and mild winters, with most rain from December to March.
The climate in San Francisco is one of mild summers and mild winters, with most rain from December to March. Afternoon highs range from 58°F (14°C) in January to 74°F (23°C) in September, and January nights average 44°F (7°C). Of the 32 in (815 mm) of rain in a typical year, 72% falls from December to March. June to September are almost completely dry.
- Warmest month
- 74°F(23°C)
- Average high, September
- Coldest nights
- 44°F(7°C)
- Average low, January
- Rain per year
- 32 in(815 mm)
- Wettest: December
- Humidity
- 71%
- Sunniest: June
Best and worst months in San Francisco
Best for weatherThe most comfortable weather comes in August and September, with highs around 73°F (23°C) and almost no rain.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 58°F (14°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Francisco weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 58°F(14°C) | 44°F(7°C) | 6.3 in(160 mm) | 78% | 1.9 |
| FebFebruary | 61°F(16°C) | 46°F(8°C) | 6.1 in(154 mm) | 72% | 2.6 |
| MarMarch | 63°F(17°C) | 47°F(8°C) | 4.4 in(112 mm) | 68% | 4.1 |
| AprApril | 65°F(19°C) | 47°F(9°C) | 2.2 in(57 mm) | 71% | 5.4 |
| MayMay | 68°F(20°C) | 50°F(10°C) | 1.0 in(25 mm) | 71% | 6.2 |
| JunJune | 71°F(21°C) | 52°F(11°C) | 0.3 in(7 mm) | 70% | 7.1 |
| JulJuly | 71°F(22°C) | 53°F(12°C) | 0.1 in(2 mm) | 74% | 6.8 |
| AugAugustBest | 72°F(22°C) | 54°F(12°C) | 0.1 in(2 mm) | 71% | 6.2 |
| SepSeptemberBest | 74°F(23°C) | 54°F(12°C) | 0.2 in(4 mm) | 69% | 5.3 |
| OctOctober | 72°F(22°C) | 52°F(11°C) | 1.7 in(42 mm) | 63% | 3.8 |
| NovNovember | 65°F(18°C) | 48°F(9°C) | 3.4 in(86 mm) | 71% | 2.5 |
| DecDecember | 59°F(15°C) | 45°F(7°C) | 6.5 in(164 mm) | 68% | 1.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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