What to Wear in San Francisco in September
Indian summer — warmest and sunniest month of the year. Expect 13°–22°C with 0 rainy days on average.
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High
22°C
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Low
13°C
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Rain days
0
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Feel
Mild & Comfortable
Typical outfit
~18°C average
About September in San Francisco
September in San Francisco typically brings indian summer — warmest and sunniest month of the year. With averages of 13°–22°C, the conditions call for ideal sightseeing weather! layer smartly — mornings and evenings will be cooler.
Mornings feel cool but afternoons can warm up significantly. A trench or jacket over a lighter outfit is ideal.
September in other cities