San Diego weather in September 2024

Expect 79°F 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 2024/2025.

  • 79°F maximum daytime temperature in September in San Diego79
    79°F max day temperature
  • 9 hours of sunshine per day
  • 1 day with some rainfall in September in San Diego1
    1 day with some rainfall
  • 63°F minimum night-time temperature in September in San Diego63
    63°F 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
  • 0.2 inches monthly rainfall in September in San Diego0.2
    0.2 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in San Diego8
    8 (Very High) UV index
  • 68°F sea temperature in September in San Diego68
    68°F sea temperature

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The September weather guide for California (San Diego) 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)  |  Imperial (°F)

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More about California

How hot is it in San Diego in September?

Daytime temperatures usually reach 79°F in San Diego in September with low heat and humidity, falling to 63°F at night.

How sunny is it in San Diego in September?

There are normally 9 hours of bright sunshine each day in San Diego in September - that's 70% of daylight hours.

How warm is the sea around San Diego in September?

The average sea temperature around San Diego in September is 68°F.

Does it ever rain in San Diego in September?

There is usually 1 day with some rain in San Diego in September and the average monthly rainfall is 0.2 inches.

What is the chance of a hurricane in San Diego in September?

On average less than 1 day in September in San Diego is likely to be affected by the passage of one or more tropical storms.

San Diego September sunrise & sunset times

Browse the sunrise and sunset times for San Diego in September 2024. Select a month to view San Diego sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st September 2024 06:24 19:12
Sunday, 15th September 2024 06:33 18:54
Monday, 30th September 2024 06:43 18:34

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