California weather in September 2025

Expect daytime maximum temperatures of 28°C in California, USA in September based on long-term weather averages. There are 9 hours of sunshine per day on average.

  • 28°C maximum daytime temperature in September in California (Los Angeles)28
    28°C max day temperature
  • 9 hours of sunshine per day
  • 2 days with some rainfall in September in California (Los Angeles)2
    2 days with some rainfall
  • 17°C minimum night-time temperature in September in California (Los Angeles)17
    17°C min night temperature
  • 12 hours of daylight per day in September in California (Los Angeles)12
    12 hours of daylight per day
  • Moderate heat & humidity in September in California (Los Angeles)M
    Moderate heat & humidity
  • 9 mm monthly rainfall in September in California (Los Angeles)9
    9 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in California (Los Angeles)8
    8 (Very High) UV index

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The September weather guide for California (Los Angeles) 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.

Top California destinations

Below are average maximum temperatures at popular countries, regions and places in California in September. Select a holiday destination to see more weather parameters.

All California destinations

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

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More about California

How hot is it in California in September?

Daytime temperatures usually reach 28°C in Los Angeles, California in September with moderate heat and humidity, falling to 17°C at night.

How sunny is it in California in September?

There are normally 9 hours of bright sunshine each day in Los Angeles, California in September - that's 75% of daylight hours.

Does it ever rain in California in September?

There are usually 2 days with some rain in Los Angeles, California in September and the average monthly rainfall is 9mm.

California September sunrise & sunset times

Browse the sunrise and sunset times for California in September 2025. Select a month to view California sunrise and sunset times for the next 12 months. The California sunrise and sunset times shown below are for Los Angeles.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:27 18:18
Monday, 15th September 2025 05:37 17:59
Tuesday, 30th September 2025 05:47 17:38

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