Santa Monica weather in September 2025

Expect 81°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Santa Monica in September. Check more long-term weather averages for Santa Monica in September before you book your next holiday to California in 2025/2026.

  • 81°F maximum daytime temperature in September in Santa Monica81
    81°F max day temperature
  • 9 hours of sunshine per day
  • 2 days with some rainfall in September in Santa Monica2
    2 days with some rainfall
  • 63°F minimum night-time temperature in September in Santa Monica63
    63°F min night temperature
  • 12 hours of daylight per day in September in Santa Monica12
    12 hours of daylight per day
  • Low heat & humidity in September in Santa MonicaL
    Low heat & humidity
  • 0.3 inches monthly rainfall in September in Santa Monica0.3
    0.3 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Santa Monica8
    8 (Very High) UV index
  • 66°F sea temperature in September in Santa Monica66
    66°F sea temperature

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The September weather guide for California (Santa Monica) 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 Santa Monica in September?

Daytime temperatures usually reach 81°F in Santa Monica in September with low heat and humidity, falling to 63°F at night.

How sunny is it in Santa Monica in September?

There are normally 9 hours of bright sunshine each day in Santa Monica in September - that's 74% of daylight hours.

How warm is the sea around Santa Monica in September?

The average sea temperature around Santa Monica in September is 66°F.

Does it ever rain in Santa Monica in September?

There are usually 2 days with some rain in Santa Monica in September and the average monthly rainfall is 0.3 inches.

Santa Monica September sunrise & sunset times

Browse the sunrise and sunset times for Santa Monica in September 2025. Select a month to view Santa Monica sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:28 18:19
Monday, 15th September 2025 05:38 18:00
Tuesday, 30th September 2025 05:48 17:39

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