Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be -10°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:01 on Sunday 14th 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 14th December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -10°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 20 kph from the north-west.

  • -10°C maximum temperature-10
    °C maximum temperature
  • -21°C minimum temperature-21
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -17°C wind chill-17
    °C wind chill
  • Moderate breeze of 20 kph from the North-West20
    kph wind from NW

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Thunder Bay weather for Monday 15th December 2025

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of -8°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0-2 cm of snow expected with 15% chance of some snow and a gentle breeze of 16 kph from the north-west.

  • -8°C maximum temperature-8
    °C maximum temperature
  • -14°C minimum temperature-14
    °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)
  • 15% chance of some snow15
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -14°C wind chill-14
    °C wind chill
  • Gentle breeze of 16 kph from the North-West16
    kph wind from NW

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Thunder Bay weather for Tuesday 16th December 2025

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 3°C, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 19% chance of some sleet or snow and a moderate breeze of 28 kph from the south-west.

  • 3°C maximum temperature3
    °C maximum temperature
  • -14°C minimum temperature-14
    °C minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 19% chance of some sleet or snow19
    % chance of some sleet or snow
  • 0-2 mm of sleet/snow expected<2
    mm of sleet/snow expected
  • -3°C wind chill-3
    °C wind chill
  • Moderate breeze of 28 kph from the South-West28
    kph wind from SW

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Thunder Bay weather for Wednesday 17th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -3°C and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 64% chance of some snow and a moderate breeze of 28 kph from the north-west.

  • -3°C maximum temperature-3
    °C maximum temperature
  • -13°C minimum temperature-13
    °C 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)
  • 64% chance of some snow64
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -10°C wind chill-10
    °C wind chill
  • Moderate breeze of 28 kph from the North-West28
    kph 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 0°C and no hours of bright sunshine. There are 10-20 cm of snow expected with 86% chance of some snow and a fresh breeze of 30 kph from the north-west.

  • 0°C maximum temperature0
    °C maximum temperature
  • -19°C minimum temperature-19
    °C minimum temperature
  • Cloudy with some snow
    cloudy with some snow
  • No hours of bright sunshine0
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 86% chance of some snow86
    % chance of some snow
  • 10-20 cm of snow expected<20
    cm of snow expected
  • -6°C wind chill-6
    °C wind chill
  • Fresh breeze of 30 kph from the North-West30
    kph wind from NW

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

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