San Francisco Weather by Month
Twelve months of San Francisco, United States weather — averages from 2006–2025.
San Francisco's warmest month is September (average high 21.8°C (71.2°F)) and the coolest is December (13.4°C (56.1°F)). The most rain falls in December (about 106 mm), and August is the driest (about 0 mm). June is the sunniest, with about 13.4 hours of sunshine a day.
Best months to visit San Francisco
Ranked within San Francisco's own year by temperature comfort, rainy days and sunshine — historical averages, not a forecast.
San Francisco month by month
January
GoodHigh 13.8°C (56.8°F)
Low 6.8°C (44.2°F)
- Rainfall
- 96 mm (3.8 in)
- Rainy days
- 9 rainy days
- Sunshine
- 7.4 h sunshine / day
February
GoodHigh 14.6°C (58.3°F)
Low 7.4°C (45.3°F)
- Rainfall
- 87 mm (3.4 in)
- Rainy days
- 8 rainy days
- Sunshine
- 8.6 h sunshine / day
March
GoodHigh 15.2°C (59.4°F)
Low 8.5°C (47.3°F)
- Rainfall
- 83 mm (3.3 in)
- Rainy days
- 10 rainy days
- Sunshine
- 9.6 h sunshine / day
April
GreatHigh 16.4°C (61.5°F)
Low 9.4°C (48.9°F)
- Rainfall
- 34 mm (1.4 in)
- Rainy days
- 4 rainy days
- Sunshine
- 11.5 h sunshine / day
May
GreatHigh 18°C (64.4°F)
Low 10.7°C (51.3°F)
- Rainfall
- 14 mm (0.6 in)
- Rainy days
- 2 rainy days
- Sunshine
- 12.9 h sunshine / day
June
GreatHigh 19.9°C (67.8°F)
Low 12.2°C (54°F)
- Rainfall
- 3 mm (0.1 in)
- Rainy days
- 0 rainy days
- Sunshine
- 13.4 h sunshine / day
July
GreatHigh 20.1°C (68.2°F)
Low 13°C (55.4°F)
- Rainfall
- 1 mm (0 in)
- Rainy days
- 0 rainy days
- Sunshine
- 13.3 h sunshine / day
August
GreatHigh 20.8°C (69.4°F)
Low 13.7°C (56.7°F)
- Rainfall
- 0 mm (0 in)
- Rainy days
- 0 rainy days
- Sunshine
- 12.5 h sunshine / day
September
GreatHigh 21.8°C (71.2°F)
Low 13.7°C (56.7°F)
- Rainfall
- 3 mm (0.1 in)
- Rainy days
- 1 rainy days
- Sunshine
- 11.5 h sunshine / day
October
GreatHigh 20.6°C (69.1°F)
Low 12.5°C (54.5°F)
- Rainfall
- 28 mm (1.1 in)
- Rainy days
- 3 rainy days
- Sunshine
- 9.8 h sunshine / day
November
GoodHigh 16.6°C (61.9°F)
Low 9.4°C (48.9°F)
- Rainfall
- 53 mm (2.1 in)
- Rainy days
- 6 rainy days
- Sunshine
- 8.4 h sunshine / day
December
GoodHigh 13.4°C (56.1°F)
Low 7.1°C (44.8°F)
- Rainfall
- 106 mm (4.2 in)
- Rainy days
- 10 rainy days
- Sunshine
- 6.9 h sunshine / day
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Based on 20 years of historical weather data (2006–2025) from Open-Meteo. Monthly averages, not a forecast.