Denver weather in September 2025

Expect daytime maximum temperatures of 77°F in Denver, Colorado in September based on long-term weather averages. There are 9 hours of sunshine per day on average.

  • 77°F maximum daytime temperature in September in Denver77
    77°F max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Denver7
    7 days with some rainfall
  • 46°F minimum night-time temperature in September in Denver46
    46°F min night temperature
  • 12 hours of daylight per day in September in Denver12
    12 hours of daylight per day
  • No heat & humidity in September in Denver0
    No heat & humidity
  • 1.2 inches monthly rainfall in September in Denver1.2
    1.2 inches of monthly rainfall
  • UV (maximum) index 7 (High) in September in Denver7
    7 (High) UV index

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The September weather guide for Colorado (Denver) 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 Denver in September?

Daytime temperatures usually reach 77°F in Denver in September with no heat and humidity, falling to 46°F at night.

How sunny is it in Denver in September?

There are normally 9 hours of bright sunshine each day in Denver in September - that's 73% of daylight hours.

Does it rain in Denver in September?

There are usually 7 days with some rain in Denver in September and the average monthly rainfall is 1.2 inches.

Denver September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:28 18:31
Monday, 15th September 2025 05:41 18:08
Tuesday, 30th September 2025 05:56 17:43

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