Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 18°F. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:01 on Monday 15th December 2025 GMT

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The 5-day weather forecast for Ontario (Thunder Bay) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Thunder Bay weather forecast by day

Below are the detailed weather forecasts for Thunder Bay for the next 5 days.

Thunder Bay weather for Monday 15th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 18°F, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 2-5 cm of snow expected with 25% chance of some snow and a gentle breeze of 9 mph from the north-west.

  • 18°F maximum temperature18
    °F maximum temperature
  • 9°F minimum temperature9
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 25% chance of some snow25
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • 7°F wind chill7
    °F wind chill
  • Gentle breeze of 9 mph from the North-West9
    mph wind from NW

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Thunder Bay weather for Tuesday 16th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 37°F and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 32% chance of some snow and a moderate breeze of 16 mph from the west.

  • 37°F maximum temperature37
    °F maximum temperature
  • 14°F minimum temperature14
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 2 hours of bright sunshine2
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 32% chance of some snow32
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 27°F wind chill27
    °F wind chill
  • Moderate breeze of 16 mph from the West16
    mph wind from W

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Thunder Bay weather for Wednesday 17th December 2025

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of 28°F, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0-2 cm of snow expected with 26% chance of some snow and a moderate breeze of 16 mph from the north-west.

  • 28°F maximum temperature28
    °F maximum temperature
  • 9°F minimum temperature9
    °F minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 26% chance of some snow26
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 16°F wind chill16
    °F wind chill
  • Moderate breeze of 16 mph from the North-West16
    mph wind from NW

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Thunder Bay weather for Thursday 18th December 2025

Expect cloudy with some snow in Thunder Bay, Ontario with a maximum temperature of 30°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 10-20 cm of snow expected with 85% chance of some snow and a moderate breeze of 16 mph from the north.

  • 30°F maximum temperature30
    °F maximum temperature
  • -8°F minimum temperature-8
    °F minimum temperature
  • Cloudy with some snow
    cloudy with some snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 85% chance of some snow85
    % chance of some snow
  • 10-20 cm of snow expected<20
    cm of snow expected
  • 19°F wind chill19
    °F wind chill
  • Moderate breeze of 16 mph from the North16
    mph wind from N

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Thunder Bay weather for Friday 19th December 2025

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of 14°F and 8 hours of bright sunshine. There are 0-2 cm of snow expected with 63% chance of some snow and a moderate breeze of 12 mph from the north-west.

  • 14°F maximum temperature14
    °F maximum temperature
  • -13°F minimum temperature-13
    °F minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 8 hours of bright sunshine8
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 63% chance of some snow63
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -0°F wind chill0
    °F wind chill
  • Moderate breeze of 12 mph from the North-West12
    mph wind from NW

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