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San Francisco in September
The weather in September
In September, San Francisco averages daytime highs of 71° and night-time lows of 55° — mild weather by day. Expect around 0.2 in of precipitation spread over about 1 wet day, with average cloud cover near 22%.
Temperatures are much the same as in August, and October brings little change. The sea averages 58°, too cold for most swimmers.
September scores 99/100 — excellent conditions for sightseeing — and ranks 3rd of the twelve months for San Francisco.
Around the middle of the month the sun rises at 06:52 and sets at 19:19 local time, giving 12 h 27 min of daylight. Days shorten by 69 minutes over the month.
Why 99/100?
How the score for September is builtBeach score this month: 52/100 (adds sea temperature and heat).
Comfort peaks for daytime highs between 18° and 25°C (64–77°F).
Festivals in the region in September
- LA Shorts FestFilm festivalLos Angeles
- LA EigaFestFilm festivalLos Angeles
- Catalina Film FestivalFilm festivalLos Angeles
- Horrible Imaginings Film FestivalFilm festivalSan Diego
Only the month is given: the exact dates change from year to year.
Around San Francisco this month
San Rafael
Richmond
United States's best in September
Salinas
San Francisco in September: quick answers
Is September a good time to visit San Francisco?
September scores 99/100 for San Francisco, which we rate as excellent. Average highs are 71°F with 1 wet days.
How warm is San Francisco in September?
Daytime highs average 71°F and night-time lows 55°F in September.
Does it rain a lot in San Francisco in September?
San Francisco receives about 0.2 in of precipitation in September, falling on around 1 days.
Can you swim in San Francisco in September?
The sea averages 58°F in September, cold for most swimmers.