Grand Junction weather in September

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Check the Grand Junction, Colorado weather in September before you book your next holiday. This gives the best indication of the weather in September and includes figures for temperature, sunshine and rainfall.

  • 27°C maximum daytime temperature in September in Grand Junction27
    27°C max day temperature
  • 10 hours of sunshine per day (78% of daylight hours) in September in Grand Junction10
    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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Metric (°C / mm)  |  Imperial (°F / inches)

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Grand Junction weather map

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Grand Junction weather by month

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