Green River weather in September 2025

Expect daytime maximum temperatures of 70°F in Green River, Wyoming in September based on long-term weather averages. There are 9 hours of sunshine per day on average.

  • 70°F maximum daytime temperature in September in Green River70
    70°F max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Green River7
    7 days with some rainfall
  • 36°F minimum night-time temperature in September in Green River36
    36°F min night temperature
  • 12 hours of daylight per day in September in Green River12
    12 hours of daylight per day
  • No heat & humidity in September in Green River0
    No heat & humidity
  • 0.8 inches monthly rainfall in September in Green River0.8
    0.8 inches of monthly rainfall
  • UV (maximum) index 7 (High) in September in Green River7
    7 (High) UV index

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The September weather guide for Wyoming (Green River) 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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How hot is it in Green River in September?

Daytime temperatures usually reach 70°F in Green River in September, falling to 36°F at night.

How sunny is it in Green River in September?

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

Does it rain in Green River in September?

There are usually 7 days with some rain in Green River in September and the average monthly rainfall is 0.8 inches.

Green River September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:44 18:50
Monday, 15th September 2025 05:59 18:26
Tuesday, 30th September 2025 06:14 18:01

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