Yosemite weather in September 2025

Expect 18°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Yosemite in September. Check more long-term weather averages for Yosemite in September before you book your next holiday to California in 2025/2026.

  • 18°C maximum daytime temperature in September in Yosemite18
    18°C max day temperature
  • 10 hours of sunshine per day
  • 5 days with some rainfall in September in Yosemite5
    5 days with some rainfall
  • 2°C minimum night-time temperature in September in Yosemite2
    2°C min night temperature
  • 12 hours of daylight per day in September in Yosemite12
    12 hours of daylight per day
  • No heat & humidity in September in Yosemite0
    No heat & humidity
  • 22 mm monthly rainfall in September in Yosemite22
    22 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Yosemite8
    8 (Very High) UV index

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The September weather guide for California (Yosemite) 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)

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More about California

How hot is it in Yosemite in September?

Daytime temperatures usually reach 18°C in Yosemite in September, falling to 2°C at night.

How sunny is it in Yosemite in September?

There are normally 10 hours of bright sunshine each day in Yosemite in September - that's 80% of daylight hours.

Does it rain in Yosemite in September?

There are usually 5 days with some rain in Yosemite in September and the average monthly rainfall is 22mm.

Yosemite September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:28 18:27
Monday, 15th September 2025 05:40 18:06
Tuesday, 30th September 2025 05:53 17:42

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