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Weather in September in San Francisco, California

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< September >
 
Normal Max/ High Temperature 23°C (74°F)
 
Average Temperature 18°C (65°F)
 
Min/ Low Temperature 13°C (55°F)
Average Sea or Water Temp 16°C(61°F)
 
Normal Precipitation 5mm (0.2in)
Number of Wet Days (probability of rain on a day) 1 (3%)
Average Sunlight per day 08:52
Average Daylight per day 12:22
Sunny (Cloudy) Daylight Hours 73% (27%)
Sun altitude at solar noon on the 21st day.
52.9°


  • The average sea tempeature is 16 °C (60.8 °F).
  • The average temperature in San Francisco, California in September is somewhat warm at 18.1 °C (64.58 °F).
  • Afternoons can be fairly hot with average high temperatures reaching 23.1 °C (73.6 °F).
  • Overnight temperatures are generally mild with an average low of 12.9 °C (55.2 °F).
  • The variation/ range of daily average temperatures in September is 10.2 °C (18.4 °F).
  • The weather in September is arid with vitually no rain. An airy 5.1mm (0.2in) of liquid descends across an average of 1 day.
  • In September the skies in San Francisco, California are quite sunny with on average a sizable 8:52 of radiant sunshine daily.
  • The shortest day is 11:47 long and the longest day is 12:58 long with an average length of 12:22.
  • There are approximately 3:21 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 72.6% of daylight hours and cloudy 27.4% of daylight hours.

Check the distance to and compare the San Francisco, California September averages with somewhere beginning with:

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Weather Trend Graph for September in San Francisco, California, Usa

Graph of weather in San Francisco, California in September

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