Thunder Bay weather in September 2021

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  • 17°C maximum daytime temperature in September in Thunder Bay17
    17°C max day temperature
  • 5 hours of sunshine per day
  • 13 days with some rainfall in September in Thunder Bay13
    13 days with some rainfall
  • 6°C minimum night-time temperature in September in Thunder Bay6
    6°C min night temperature
  • 13 hours of daylight per day in September in Thunder Bay13
    13 hours of daylight per day
  • No heat & humidity in September in Thunder Bay0
    No heat & humidity
  • 88 mm monthly rainfall in September in Thunder Bay88
    88 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Thunder Bay5
    5 (Moderate) UV index
  • 13°C sea temperature in September in Thunder Bay13
    13°C sea temperature

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The September weather guide for Thunder Bay, Ontario 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.

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How warm is it in Thunder Bay in September?

Daytime temperatures usually reach 17°C in Thunder Bay in September, falling to 6°C at night.

How sunny is it in Thunder Bay in September?

There are normally 5 hours of bright sunshine each day in Thunder Bay in September - that's 42% of daylight hours.

How warm is the sea around Thunder Bay in September?

The average sea temperature around Thunder Bay in September is 13°C.

Does it rain in Thunder Bay in September?

There are usually 13 days with some rain in Thunder Bay in September and the average monthly rainfall is 88mm.

Thunder Bay sunrise & sunset times for September 2021

Browse the sunrise & sunset times for Thunder Bay in September 2021. Select a month to view Thunder Bay sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st September 2021 07:15 20:38
Wednesday, 15th September 2021 07:34 20:09
Thursday, 30th September 2021 07:55 19:37
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Metric (°C / mm)  |  Imperial (°F / inches)

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Where is hot in Ontario in September for 2021/2022?

Below are average maximum temperatures at popular destinations in Ontario in September. Select a destination to see more weather parameters.

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