Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be -13°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:00 on Sunday 21st 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 Sunday 21st December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -13°C, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 21 kph from the west.

  • -13°C maximum temperature-13
    °C maximum temperature
  • -19°C minimum temperature-19
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -22°C wind chill-22
    °C wind chill
  • Moderate breeze of 21 kph from the West21
    kph wind from W

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Thunder Bay weather for Monday 22nd December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -5°C and 1 hour of bright sunshine. There are 0 cm of snow expected and a light breeze of 11 kph from the east.

  • -5°C maximum temperature-5
    °C maximum temperature
  • -13°C minimum temperature-13
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 0 cm of snow expected0
    cm of snow expected
  • -9°C wind chill-9
    °C wind chill
  • Light breeze of 11 kph from the East11
    kph wind from E

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Thunder Bay weather for Tuesday 23rd December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -2°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 26% chance of some snow and a moderate breeze of 22 kph from the north-west.

  • -2°C maximum temperature-2
    °C maximum temperature
  • -14°C minimum temperature-14
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 1 hour of bright sunshine1
    hour 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
  • -9°C wind chill-9
    °C wind chill
  • Moderate breeze of 22 kph from the North-West22
    kph wind from NW

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Thunder Bay weather for Wednesday 24th December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -4°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and a light breeze of 8 kph from the south.

  • -4°C maximum temperature-4
    °C maximum temperature
  • -15°C minimum temperature-15
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -7°C wind chill-7
    °C wind chill
  • Light breeze of 8 kph from the South8
    kph wind from S

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Thunder Bay weather for Thursday 25th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -5°C and no hours of bright sunshine. There are 0-2 cm of snow expected with 56% chance of some snow and a gentle breeze of 14 kph from the north-east.

  • -5°C maximum temperature-5
    °C maximum temperature
  • -10°C minimum temperature-10
    °C 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)
  • 56% chance of some snow56
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -10°C wind chill-10
    °C wind chill
  • Gentle breeze of 14 kph from the North-East14
    kph wind from NE

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Metric (°C / mm)  |  Imperial (°F / inches)

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