Kalispell weather in September 2025

Expect 20°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Kalispell in September. Check more long-term weather averages for Kalispell in September before you book your next holiday to Montana in 2025/2026.

  • 20°C maximum daytime temperature in September in Kalispell20
    20°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Kalispell8
    8 days with some rainfall
  • 4°C minimum night-time temperature in September in Kalispell4
    4°C min night temperature
  • 13 hours of daylight per day in September in Kalispell13
    13 hours of daylight per day
  • No heat & humidity in September in Kalispell0
    No heat & humidity
  • 36 mm monthly rainfall in September in Kalispell36
    36 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Kalispell5
    5 (Moderate) UV index

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The September weather guide for Montana (Kalispell) 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 Kalispell in September?

Daytime temperatures usually reach 20°C in Kalispell in September, falling to 4°C at night.

How sunny is it in Kalispell in September?

There are normally 8 hours of bright sunshine each day in Kalispell in September - that's 61% of daylight hours.

Does it rain in Kalispell in September?

There are usually 8 days with some rain in Kalispell in September and the average monthly rainfall is 36mm.

Kalispell September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:56 19:18
Monday, 15th September 2025 06:15 18:49
Tuesday, 30th September 2025 06:36 18:18

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