Grand Junction weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Grand Junction in September. Check more long-term weather averages for Grand Junction in September before you book your next holiday to Colorado in 2025/2026.

  • 27°C maximum daytime temperature in September in Grand Junction27
    27°C max day temperature
  • 10 hours of sunshine per day
  • 6 days with some rainfall in September in Grand Junction6
    6 days with some rainfall
  • 10°C minimum night-time temperature in September in Grand Junction10
    10°C min night temperature
  • 12 hours of daylight per day in September in Grand Junction12
    12 hours of daylight per day
  • Low heat & humidity in September in Grand JunctionL
    Low heat & humidity
  • 21 mm monthly rainfall in September in Grand Junction21
    21 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Grand Junction7
    7 (High) UV index

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The September weather guide for Colorado (Grand Junction) 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 Grand Junction in September?

Daytime temperatures usually reach 27°C in Grand Junction in September with low heat and humidity, falling to 10°C at night.

How sunny is it in Grand Junction in September?

There are normally 10 hours of bright sunshine each day in Grand Junction in September - that's 78% of daylight hours.

Does it rain in Grand Junction in September?

There are usually 6 days with some rain in Grand Junction in September and the average monthly rainfall is 21mm.

Grand Junction September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:43 18:44
Monday, 15th September 2025 05:56 18:22
Tuesday, 30th September 2025 06:10 17:58

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