San Francisco weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
San Francisco September weather at a glance
In September, San Francisco averages 17°C, with typical highs of 21°C and lows of 14.3°C. The historical average is 2 wet days and 81% humidity.
San Francisco September temperature & humidity
San Francisco September rain & wet days
Pack a compact umbrella. Keep an indoor stop available between outdoor activities.
What to wear in San Francisco in September
T-shirts or long sleeves with one light outer layer should be comfortable.
- DaytimeLong sleeves and a light jacket · average high 21°C
- Morning & eveningLong sleeves with a jacket or cardigan · average low 14.3°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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San Francisco September sunrise & sunset times
2026 September · Local time (America/Los_Angeles)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 06:40 | 19:39 | 12h 59m |
| 2026-09-15 | 06:52 | 19:17 | 12h 26m |
| 2026-09-30 | 07:05 | 18:54 | 11h 49m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
San Francisco travel updates
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- San Francisco State campusFogCam · Updated images
Check the camera timestamp at the source.
Today’s weather and forecast
Check temperature, rain and wind in Windy.
Forecast · Windy. Monthly averages are in the Temperature section.
San Francisco news search
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San Francisco city map
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San Francisco travel essentials
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Best months to visit San Francisco
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is San Francisco weather like in September?
In September, San Francisco averages 17°C, with typical highs of 21°C and lows of 14.3°C. The historical average is 2 wet days and 81% humidity. Our weather-comfort rating for this month is excellent.
Does it rain a lot in San Francisco in September?
There are about 2 wet days in September. A compact umbrella is still useful.
What should I wear in San Francisco in September?
T-shirts or long sleeves with one light outer layer should be comfortable.
What are the best months to visit San Francisco?
Recent weather data rates January, April, May, June among the more comfortable months.
Where can I check San Francisco weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
What time are sunrise and sunset in San Francisco in September?
On 2026-09-15, calculated sunrise is 06:52 and sunset is 19:17 in local time (America/Los_Angeles). Times vary by date and terrain.
San Francisco weather by month
More Americas destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations