San Francisco weather in September
September in San Francisco averages 70°F by day and 56°F at night, with 0.1 inches of precipitation. It is the 1st-warmest and 10th-wettest month of the year here.
- Average high
- 70°F+2° vs August
- Average low
- 56°F0 nights below freezing
- Precipitation
- 0.1 in0 days with 0.1 in. or more
- Snow
- 0.0 in1 days at 90°F+
Is September a good time to visit San Francisco?
Yes. September is one of the most comfortable months in San Francisco by our rule (highs of 62 to 86°F, lows of 42°F or more and under 4.5 inches of precipitation). The most comfortable months overall are March to November.
Get outside in San Francisco in September
September is made for being outside. Try Golden Gate Park, Presidio of San Francisco, Coit Tower, San Francisco Zoo. All things to do in San Francisco.
On September 15 the sun rises at 6:51 am and sets at 7:17 pm, giving 12h 25m of daylight. Daylight all year.
What to pack for San Francisco in September
- T-shirts and a light jacket or sweater
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| San Francisco | 70°F | 56°F | 0.1 in | |
| Daly City, CA | 5 mi | 65°F | 55°F | 0.1 in |
| Alameda, CA | 10 mi | 74°F | 56°F | 0.1 in |
| Oakland, CA | 10 mi | 75°F | 57°F | 0.1 in |
| Berkeley, CA | 10 mi | 76°F | 54°F | 0.1 in |
| Richmond, CA | 12 mi | 75°F | 56°F | 0.0 in |
| San Leandro, CA | 16 mi | 77°F | 58°F | 0.1 in |
Frequently asked questions
What is the weather like in San Francisco in September?
In September, San Francisco averages a high of 70°F and a low of 56°F, with 0.1 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit San Francisco?
Yes. September is one of San Francisco's most comfortable months by our rule: highs between 62°F and 86°F, lows of 42°F or more and modest rain.
Does it snow in San Francisco in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: San Francisco in August and San Francisco in October. All twelve months: San Francisco weather by month.
NOAA NCEI 1991-2020 climate normals, station San Francisco Downtown, CA, 0.5 miles from the city center; snowfall from San Francisco Oceanside, CA.