San Diego weather in September 2019

  • 26°C maximum daytime temperature in September in San Diego26
    26°C max day temperature
  • 9 hours of sunshine per day
  • 1 day with some rainfall in September in San Diego1
    1 day with some rainfall
  • 17°C minimum night-time temperature in September in San Diego17
    17°C min night temperature
  • 12 hours of daylight per day in September in San Diego12
    12 hours of daylight per day
  • Low heat & humidity in September in San DiegoL
    Low heat & humidity
  • 4 mm monthly rainfall in September in San Diego4
    4 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in San Diego8
    8 (Very High) UV index
  • 20°C sea temperature in September in San Diego20
    20°C sea temperature

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Expect 26°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in San Diego in September. Check more long-term weather averages for San Diego in September before you book your next holiday to California in 2019/2020.

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More about San Diego

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The September weather guide for San Diego, 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.

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

Guide to San Diego weather in September

The average maximum daytime temperature in San Diego in September is a warm 26°C (79°F) with low heat & humidity. The average night-time temperature is usually a comfortable 17°C (63°F). There are usually 9 hours of bright sunshine each day, which represents 70% of the 12 hours of daylight.

Expect 4mm (0.2 inches) of rainfall across the whole of September with 1 day with some rain falling. Maximum UV levels will be very high (8 UV index) at midday when the skies are clear.

The average sea temperature in and around San Diego in September is 20°C (68°F).

San Diego sunrise & sunset times for September 2019

Browse the sunrise & sunset times for San Diego in September 2019. Select a month to view San Diego sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st September 2019 06:23 19:13
Monday, 2nd September 2019 06:24 19:12
Tuesday, 3rd September 2019 06:25 19:11
Wednesday, 4th September 2019 06:25 19:10
Thursday, 5th September 2019 06:26 19:08
Friday, 6th September 2019 06:26 19:07
Saturday, 7th September 2019 06:27 19:06
Sunday, 8th September 2019 06:28 19:04
Monday, 9th September 2019 06:28 19:03
Tuesday, 10th September 2019 06:29 19:02
Wednesday, 11th September 2019 06:30 19:00
Thursday, 12th September 2019 06:30 18:59
Friday, 13th September 2019 06:31 18:58
Saturday, 14th September 2019 06:32 18:56
Sunday, 15th September 2019 06:32 18:55
Monday, 16th September 2019 06:33 18:54
Tuesday, 17th September 2019 06:34 18:52
Wednesday, 18th September 2019 06:34 18:51
Thursday, 19th September 2019 06:35 18:50
Friday, 20th September 2019 06:35 18:48
Saturday, 21st September 2019 06:36 18:47
Sunday, 22nd September 2019 06:37 18:45
Monday, 23rd September 2019 06:37 18:44
Tuesday, 24th September 2019 06:38 18:43
Wednesday, 25th September 2019 06:39 18:41
Thursday, 26th September 2019 06:39 18:40
Friday, 27th September 2019 06:40 18:39
Saturday, 28th September 2019 06:41 18:37
Sunday, 29th September 2019 06:41 18:36
Monday, 30th September 2019 06:42 18:35
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Popular California destinations

Below are average maximum temperatures at popular destinations in California in September. Select a destination to see more weather parameters.

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