Weather in San Francisco in September 2017

Check the weather in San Francisco in September before you book your next holiday in California. Long-term weather averages give the best indication of the weather in September 2017 and include figures for temperature, sunshine and rainfall plus sunrise & sunset times for San Francisco, California, United States.

Weather in San Francisco in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All months

  • 22°C maximum daytime temperature in September in San Francisco22
    22°C max day temperature
  • 9 hours of sunshine per day (73% of daylight hours) in September in San Francisco9
    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

The average maximum daytime temperature in San Francisco in September is a warm 22°C (72°F). There are usually 9 hours of bright sunshine each day, which represents 73% of the 12 hours of daylight. The average sea temperature in and around San Francisco in September is 14°C (57°F).

Expect 7mm (0.3 inches) of rainfall across the whole of September with 2 days with some rain falling. Maximum UV levels will be high (7 UV index) at midday when the skies are clear. The average night-time temperature is usually a cool 13°C (55°F).

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

More about San Francisco weather

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  • Depart from Manchester Airport
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San Francisco sunrise & sunset times for September 2017

Browse the sunrise & sunset times for San Francisco in September 2017. Select a month to view San Francisco sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st September 2017 06:40 19:38
Saturday, 2nd September 2017 06:41 19:37
Sunday, 3rd September 2017 06:42 19:35
Monday, 4th September 2017 06:43 19:34
Tuesday, 5th September 2017 06:43 19:32
Wednesday, 6th September 2017 06:44 19:31
Thursday, 7th September 2017 06:45 19:29
Friday, 8th September 2017 06:46 19:28
Saturday, 9th September 2017 06:47 19:26
Sunday, 10th September 2017 06:48 19:25
Monday, 11th September 2017 06:48 19:23
Tuesday, 12th September 2017 06:49 19:22
Wednesday, 13th September 2017 06:50 19:20
Thursday, 14th September 2017 06:51 19:18
Friday, 15th September 2017 06:52 19:17
Saturday, 16th September 2017 06:53 19:15
Sunday, 17th September 2017 06:54 19:14
Monday, 18th September 2017 06:54 19:12
Tuesday, 19th September 2017 06:55 19:11
Wednesday, 20th September 2017 06:56 19:09
Thursday, 21st September 2017 06:57 19:08
Friday, 22nd September 2017 06:58 19:06
Saturday, 23rd September 2017 06:59 19:04
Sunday, 24th September 2017 06:59 19:03
Monday, 25th September 2017 07:00 19:01
Tuesday, 26th September 2017 07:01 19:00
Wednesday, 27th September 2017 07:02 18:58
Thursday, 28th September 2017 07:03 18:57
Friday, 29th September 2017 07:04 18:55
Saturday, 30th September 2017 07:05 18:54
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  • Depart from Manchester Airport
  • Prices shown are one way based on return flights

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San Francisco weather by month

Check San Francisco weather for a particular month by selecting from the list below. Monthly weather guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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