Fort Simpson weather in September 2025

Expect 13°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Fort Simpson in September based on long-term weather averages. There is usually 9 days with some rainfall and 30 mm of average monthly rainfall in September.

  • 13°C maximum daytime temperature in September in Fort Simpson13
    13°C max day temperature
  • 5 hours of sunshine per day
  • 9 days with some rainfall in September in Fort Simpson9
    9 days with some rainfall
  • 2°C minimum night-time temperature in September in Fort Simpson2
    2°C min night temperature
  • 13 hours of daylight per day in September in Fort Simpson13
    13 hours of daylight per day
  • No heat & humidity in September in Fort Simpson0
    No heat & humidity
  • 30 mm monthly rainfall in September in Fort Simpson30
    30 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Fort Simpson2
    2 (Low) UV index

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The September weather guide for Northwest Territories (Fort Simpson) 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 warm is it in Fort Simpson in September?

Daytime temperatures usually reach 13°C in Fort Simpson in September, falling to 2°C at night.

How sunny is it in Fort Simpson in September?

There are normally 5 hours of bright sunshine each day in Fort Simpson in September - that's 37% of daylight hours.

Does it rain in Fort Simpson in September?

There are usually 9 days with some rain in Fort Simpson in September and the average monthly rainfall is 30mm.

Fort Simpson September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:56 20:12
Monday, 15th September 2025 06:32 19:27
Tuesday, 30th September 2025 07:11 18:38

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