Thief River Falls weather in September 2025

Expect daytime maximum temperatures of 20°C in Thief River Falls in September based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 60 mm of rainfall in the month.

  • 20°C maximum daytime temperature in September in Thief River Falls20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in Thief River Falls9
    9 days with some rainfall
  • 6°C minimum night-time temperature in September in Thief River Falls6
    6°C min night temperature
  • 13 hours of daylight per day in September in Thief River Falls13
    13 hours of daylight per day
  • No heat & humidity in September in Thief River Falls0
    No heat & humidity
  • 60 mm monthly rainfall in September in Thief River Falls60
    60 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Thief River Falls5
    5 (Moderate) UV index

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The September weather guide for Minnesota (Thief River Falls) 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 Thief River Falls in September?

Daytime temperatures usually reach 20°C in Thief River Falls in September, falling to 6°C at night.

How sunny is it in Thief River Falls in September?

There are normally 7 hours of bright sunshine each day in Thief River Falls in September - that's 53% of daylight hours.

Does it rain in Thief River Falls in September?

There are usually 9 days with some rain in Thief River Falls in September and the average monthly rainfall is 60mm.

Thief River Falls September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:43 19:05
Monday, 15th September 2025 06:02 18:36
Tuesday, 30th September 2025 06:23 18:05

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