Fort Collins weather in September 2025

Expect 24°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Fort Collins in September. Check more long-term weather averages for Fort Collins in September before you book your next holiday to Colorado in 2025/2026.

  • 24°C maximum daytime temperature in September in Fort Collins24
    24°C max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Fort Collins7
    7 days with some rainfall
  • 8°C minimum night-time temperature in September in Fort Collins8
    8°C min night temperature
  • 12 hours of daylight per day in September in Fort Collins12
    12 hours of daylight per day
  • No heat & humidity in September in Fort Collins0
    No heat & humidity
  • 32 mm monthly rainfall in September in Fort Collins32
    32 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Fort Collins7
    7 (High) UV index

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Recommended for Colorado

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  • Destinations include Europe, Middle East & Africa
  • Valid for up to 2 adults & 2 kids aged up to 12

The September weather guide for Colorado (Fort Collins) 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 Fort Collins in September?

Daytime temperatures usually reach 24°C in Fort Collins in September, falling to 8°C at night.

How sunny is it in Fort Collins in September?

There are normally 9 hours of bright sunshine each day in Fort Collins in September - that's 72% of daylight hours.

Does it rain in Fort Collins in September?

There are usually 7 days with some rain in Fort Collins in September and the average monthly rainfall is 32mm.

Fort Collins September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:28 18:32
Monday, 15th September 2025 05:41 18:09
Tuesday, 30th September 2025 05:56 17:44

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