Green River weather in September 2025

Expect 21°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Green River in September. Check more long-term weather averages for Green River in September before you book your next holiday to Wyoming in 2025/2026.

  • 21°C maximum daytime temperature in September in Green River21
    21°C max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Green River7
    7 days with some rainfall
  • 2°C minimum night-time temperature in September in Green River2
    2°C 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
  • 21 mm monthly rainfall in September in Green River21
    21 mm 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Green River in September?

Daytime temperatures usually reach 21°C in Green River in September, falling to 2°C 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 21mm.

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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