Yellowknife weather in September 2025

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

  • 10°C maximum daytime temperature in September in Yellowknife10
    10°C max day temperature
  • 5 hours of sunshine per day
  • 10 days with some rainfall in September in Yellowknife10
    10 days with some rainfall
  • 3°C minimum night-time temperature in September in Yellowknife3
    3°C min night temperature
  • 13 hours of daylight per day in September in Yellowknife13
    13 hours of daylight per day
  • No heat & humidity in September in Yellowknife0
    No heat & humidity
  • 29 mm monthly rainfall in September in Yellowknife29
    29 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Yellowknife2
    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.

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

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More about Canada

How warm is it in Yellowknife in September?

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

How sunny is it in Yellowknife in September?

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

Does it rain in Yellowknife in September?

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

Yellowknife September sunrise & sunset times

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

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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