Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 19°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 Friday 12th 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 Friday 12th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 19°F and no hours of bright sunshine. There are 0-2 cm of snow expected with 98% chance of some snow and a moderate breeze of 14 mph from the north-west.

  • 19°F maximum temperature19
    °F maximum temperature
  • -2°F minimum temperature-2
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • No hours of bright sunshine0
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 98% chance of some snow98
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 5°F wind chill5
    °F wind chill
  • Moderate breeze of 14 mph from the North-West14
    mph wind from NW

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Thunder Bay weather for Saturday 13th December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 1°F, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 14 mph from the north-west.

  • 1°F maximum temperature1
    °F maximum temperature
  • -6°F minimum temperature-6
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -17°F wind chill-17
    °F wind chill
  • Moderate breeze of 14 mph from the North-West14
    mph wind from NW

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Thunder Bay weather for Sunday 14th December 2025

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of 10°F, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0-2 cm of snow expected with 25% chance of some snow and a gentle breeze of 12 mph from the north-west.

  • 10°F maximum temperature10
    °F maximum temperature
  • -4°F minimum temperature-4
    °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)
  • 25% chance of some snow25
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -4°F wind chill-4
    °F wind chill
  • Gentle breeze of 12 mph from the North-West12
    mph wind from NW

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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 0-2 cm of snow expected with 29% chance of some snow and a gentle breeze of 9 mph from the north-west.

  • 18°F maximum temperature18
    °F maximum temperature
  • 5°F minimum temperature5
    °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)
  • 29% chance of some snow29
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 9°F wind chill9
    °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 36°F and 1 hour of bright sunshine. There are 2-5 cm of snow expected with 43% chance of some snow and a gentle breeze of 11 mph from the south.

  • 36°F maximum temperature36
    °F maximum temperature
  • 7°F minimum temperature7
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 43% chance of some snow43
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • 28°F wind chill28
    °F wind chill
  • Gentle breeze of 11 mph from the South11
    mph wind from S

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