Thunder Bay weather in January 2026

Expect daytime maximum temperatures of -9°C in Thunder Bay, Ontario in January based on long-term weather averages. There are 4 hours of sunshine per day on average with 11 days with some rainfall, which might fall as snow.

  • -9°C maximum daytime temperature in January in Thunder Bay-9
    -9°C max day temperature
  • 4 hours of sunshine per day
  • 11 days with some rainfall in January in Thunder Bay11
    11 days with some rainfall
  • -21°C minimum night-time temperature in January in Thunder Bay-21
    -21°C min night temperature
  • 9 hours of daylight per day in January in Thunder Bay9
    9 hours of daylight per day
  • No heat & humidity in January in Thunder Bay0
    No heat & humidity
  • 38 mm monthly rainfall in January in Thunder Bay38
    38 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Thunder Bay1
    1 (Low) UV index
  • 2°C sea temperature in January in Thunder Bay2
    2°C sea temperature

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The January 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 cold is it in Thunder Bay in January?

Daytime temperatures usually reach -9°C in Thunder Bay in January, falling to -21°C at night.

How sunny is it in Thunder Bay in January?

There are normally 4 hours of bright sunshine each day in Thunder Bay in January - that's 42% of daylight hours.

Is the sea cold around Thunder Bay in January?

The average sea temperature around Thunder Bay in January is 2°C.

Does it rain in Thunder Bay in January?

There are usually 11 days with some rain in Thunder Bay in January and the average monthly rainfall is 38mm. Rain may fall as snow in this month.

Thunder Bay January sunrise & sunset times

Browse the sunrise and sunset times for Thunder Bay in January 2026. Select a month to view Thunder Bay sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 08:49 17:13
Friday, 16th January 2026 08:43 17:31
Saturday, 31st January 2026 08:27 17:55

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