San Francisco Weather in September – Average Temperature and Rainfall
- High
- 20.9°
- Low
- 14.4°
- Rainfall
- 4 mm
- Rainy season
- 1d
- max
- 38.5°
- min
- 10.9°
September
- Early
- 21.2° 0.4 mm
- Mid
- 20.2° 2.2 mm
- Late
- 21.3° 1.2 mm
Summary
The climate figures for San Francisco are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 610 mm.
The rainy season runs January–December. The wettest month is December with 132.7 mm across 10 rain days; the driest is July at just 0.3 mm.
The hottest month is September (average high 20.9°C) and the coolest is December (13.5°C).
The most comfortable time to visit San Francisco is July — less rain and milder heat.
Monthly averages
Common questions
Will it rain in San Francisco today?
No. The chance of rain today is only about 2%.
How hot is it in San Francisco today?
Between 14°C and 16°C, with a felt maximum of 15°C.
What is the weather in San Francisco tomorrow?
Tomorrow: overcast, 13–21°C, with a 1% chance of rain.
San Francisco
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