Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 3°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 Tuesday 16th 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 Tuesday 16th December 2025

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of 3°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0-2 cm of snow expected with 25% chance of some snow and a moderate breeze of 27 kph from the south-west.

  • 3°C maximum temperature3
    °C maximum temperature
  • -15°C minimum temperature-15
    °C minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 5 hours of bright sunshine5
    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
  • -3°C wind chill-3
    °C wind chill
  • Moderate breeze of 27 kph from the South-West27
    kph wind from SW

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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 -2°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0-2 cm of snow expected with 73% chance of some snow and a moderate breeze of 27 kph from the north-west.

  • -2°C maximum temperature-2
    °C maximum temperature
  • -12°C minimum temperature-12
    °C 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)
  • 73% chance of some snow73
    % 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 27 kph from the North-West27
    kph wind from NW

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Thunder Bay weather for Thursday 18th December 2025

Expect mostly cloudy with snow in Thunder Bay, Ontario with a maximum temperature of 0°C and no hours of bright sunshine. There are 10-20 cm of snow expected with 79% chance of some snow and a moderate breeze of 26 kph from the north.

  • 0°C maximum temperature0
    °C maximum temperature
  • -20°C minimum temperature-20
    °C minimum temperature
  • Mostly cloudy with snow
    mostly cloudy with snow
  • No hours of bright sunshine0
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 79% chance of some snow79
    % chance of some snow
  • 10-20 cm of snow expected<20
    cm of snow expected
  • -6°C wind chill-6
    °C wind chill
  • Moderate breeze of 26 kph from the North26
    kph wind from N

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Thunder Bay weather for Friday 19th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -9°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 2-5 cm of snow expected with 84% chance of some snow and a gentle breeze of 19 kph from the north-west.

  • -9°C maximum temperature-9
    °C maximum temperature
  • -23°C minimum temperature-23
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 84% chance of some snow84
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • -16°C wind chill-16
    °C wind chill
  • Gentle breeze of 19 kph from the North-West19
    kph wind from NW

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Thunder Bay weather for Saturday 20th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -6°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 39% chance of some snow and a moderate breeze of 20 kph from the north-west.

  • -6°C maximum temperature-6
    °C maximum temperature
  • -15°C minimum temperature-15
    °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)
  • 39% chance of some snow39
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -12°C wind chill-12
    °C wind chill
  • Moderate breeze of 20 kph from the North-West20
    kph wind from NW

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

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