Wyoming weather in September 2025

Expect 22°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Wyoming in September. Check more long-term weather averages for Wyoming in September before you book your next holiday to Wyoming in 2025/2026.

  • 22°C maximum daytime temperature in September in Wyoming (Cheyenne)22
    22°C max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Wyoming (Cheyenne)7
    7 days with some rainfall
  • 6°C minimum night-time temperature in September in Wyoming (Cheyenne)6
    6°C min night temperature
  • 12 hours of daylight per day in September in Wyoming (Cheyenne)12
    12 hours of daylight per day
  • No heat & humidity in September in Wyoming (Cheyenne)0
    No heat & humidity
  • 34 mm monthly rainfall in September in Wyoming (Cheyenne)34
    34 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Wyoming (Cheyenne)7
    7 (High) UV index

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The September weather guide for Wyoming (Cheyenne) 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 Wyoming destinations

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

All Wyoming destinations

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

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How hot is it in Wyoming in September?

Daytime temperatures usually reach 22°C in Cheyenne, Wyoming in September, falling to 6°C at night.

How sunny is it in Wyoming in September?

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

Does it rain in Wyoming in September?

There are usually 7 days with some rain in Cheyenne, Wyoming in September and the average monthly rainfall is 34mm.

Wyoming September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 18:31
Monday, 15th September 2025 05:40 18:08
Tuesday, 30th September 2025 05:55 17:42

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