Northwest Territories weather in September 2025

Expect 10°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Northwest Territories in September. Check more long-term weather averages for Northwest Territories in September before you book your next holiday to Northwest Territories in 2025/2026.

  • 10°C maximum daytime temperature in September in Northwest Territories (Yellowknife)10
    10°C max day temperature
  • 5 hours of sunshine per day
  • 10 days with some rainfall in September in Northwest Territories (Yellowknife)10
    10 days with some rainfall
  • 3°C minimum night-time temperature in September in Northwest Territories (Yellowknife)3
    3°C min night temperature
  • 13 hours of daylight per day in September in Northwest Territories (Yellowknife)13
    13 hours of daylight per day
  • No heat & humidity in September in Northwest Territories (Yellowknife)0
    No heat & humidity
  • 29 mm monthly rainfall in September in Northwest Territories (Yellowknife)29
    29 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Northwest Territories (Yellowknife)2
    2 (Low) UV index

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The September weather guide for Northwest Territories (Yellowknife) 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.

Top Northwest Territories destinations

Below are average maximum temperatures at popular countries, regions and places in the Northwest Territories in September. Select a holiday destination to see more weather parameters.

All Northwest Territories destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How warm is it in the Northwest Territories in September?

Daytime temperatures usually reach 10°C in Yellowknife, Northwest Territories in September, falling to 3°C at night.

How sunny is it in the Northwest Territories in September?

There are normally 5 hours of bright sunshine each day in Yellowknife, Northwest Territories in September - that's 39% of daylight hours.

Does it rain in the Northwest Territories in September?

There are usually 10 days with some rain in Yellowknife, Northwest Territories in September and the average monthly rainfall is 29mm.

Northwest Territories September sunrise & sunset times

Browse the sunrise and sunset times for Northwest Territories in September 2025. Select a month to view Northwest Territories sunrise and sunset times for the next 12 months. The Northwest Territories sunrise and sunset times shown below are for Yellowknife.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:27 19:46
Monday, 15th September 2025 06:04 19:00
Tuesday, 30th September 2025 06:44 18:10

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