Thunder Bay weather in October 2025

Expect daytime maximum temperatures of 10°C in Thunder Bay, Ontario in October based on long-term weather averages. There are 4 hours of sunshine per day on average with 11 days with some rainfall and typically 60 mm of rainfall in the month.

  • 10°C maximum daytime temperature in October in Thunder Bay10
    10°C max day temperature
  • 4 hours of sunshine per day
  • 11 days with some rainfall in October in Thunder Bay11
    11 days with some rainfall
  • 1°C minimum night-time temperature in October in Thunder Bay1
    1°C min night temperature
  • 11 hours of daylight per day in October in Thunder Bay11
    11 hours of daylight per day
  • No heat & humidity in October in Thunder Bay0
    No heat & humidity
  • 60 mm monthly rainfall in October in Thunder Bay60
    60 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in October in Thunder Bay2
    2 (Low) UV index
  • 8°C sea temperature in October in Thunder Bay8
    8°C sea temperature

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The October weather guide for Ontario (Thunder Bay) 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 Ontario

How warm is it in Thunder Bay in October?

Daytime temperatures usually reach 10°C in Thunder Bay in October, falling to 1°C at night.

How sunny is it in Thunder Bay in October?

There are normally 4 hours of bright sunshine each day in Thunder Bay in October - that's 36% of daylight hours.

Is the sea cold around Thunder Bay in October?

The average sea temperature around Thunder Bay in October is 8°C.

Does it rain in Thunder Bay in October?

There are usually 11 days with some rain in Thunder Bay in October and the average monthly rainfall is 60mm.

Thunder Bay October sunrise & sunset times

Browse the sunrise and sunset times for Thunder Bay in October 2025. Select a month to view Thunder Bay sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st October 2025 06:57 18:35
Thursday, 16th October 2025 07:19 18:05
Friday, 31st October 2025 07:42 17:39

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