San Francisco weather in September

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Check the San Francisco, California weather in September before you book your next holiday. This gives the best indication of the weather in September and includes figures for temperature, sunshine and rainfall.

  • 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

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

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