San Francisco weather in September 2021

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  • 22°C maximum daytime temperature in September in San Francisco22
    22°C max day temperature
  • 9 hours of sunshine per day
  • 2 days with some rainfall in September in San Francisco2
    2 days with some rainfall
  • 13°C minimum night-time temperature in September in San Francisco13
    13°C min night temperature
  • 12 hours of daylight per day in September in San Francisco12
    12 hours of daylight per day
  • No heat & humidity in September in San Francisco0
    No heat & humidity
  • 7 mm monthly rainfall in September in San Francisco7
    7 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in San Francisco7
    7 (High) UV index
  • 14°C sea temperature in September in San Francisco14
    14°C sea temperature
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The September weather guide for San Francisco, California shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

How hot is it in San Francisco in September?

Daytime temperatures usually reach 22°C in San Francisco in September, falling to 13°C at night.

How sunny is it in San Francisco in September?

There are normally 9 hours of bright sunshine each day in San Francisco in September - that's 73% of daylight hours.

How warm is the sea around San Francisco in September?

The average sea temperature around San Francisco in September is 14°C.

Does it ever rain in San Francisco in September?

There are usually 2 days with some rain in San Francisco in September and the average monthly rainfall is 7mm.

Metric (°C / mm)  |  Imperial (°F / inches)

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San Francisco sunrise & sunset times for September 2021

Browse the sunrise and sunset times for San Francisco in September 2021. Select a month to view San Francisco sunrise & sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st September 2021 06:40 19:38
Wednesday, 15th September 2021 06:52 19:17
Thursday, 30th September 2021 07:05 18:54
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  • Receive online results within 24-72 hours once test at lab
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Expires at 23:59 on Friday 31st Dec 2021

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