San Francisco Weather in September
United States · 30-year monthly averages
🌟 Great time to visit
September in San Francisco is pleasantly warm, with average daytime highs around 24°C (75°F) and nighttime lows near 13°C (56°F). Expect roughly 2mm of precipitation spread over about 1 rainy days, and rain is rare.
Avg high
24°C
75°F
Avg low
13°C
56°F
Rainfall
2mm
very dry
Rainy days
1
days with ≥1mm
🎒 What to pack
- light layers
- comfortable walking shoes
September vs the rest of the year
FAQ
- How hot is San Francisco in September?
- September in San Francisco is pleasantly warm, with average daytime highs around 24°C (75°F) and nighttime lows near 13°C (56°F). Expect roughly 2mm of precipitation spread over about 1 rainy days, and rain is rare.
- Does it rain a lot in San Francisco in September?
- San Francisco sees around 2mm of precipitation in September on average — very dry by global standards.
- Is September a good time to visit San Francisco?
- September is one of the best months to visit San Francisco — comfortable temperatures and manageable rainfall.