Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be -4°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 Saturday 20th 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 Saturday 20th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -4°C and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 11% chance of some snow and a moderate breeze of 26 kph from the west.

  • -4°C maximum temperature-4
    °C maximum temperature
  • -16°C minimum temperature-16
    °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)
  • 11% chance of some snow11
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -11°C wind chill-11
    °C wind chill
  • Moderate breeze of 26 kph from the West26
    kph wind from W

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Thunder Bay weather for Sunday 21st December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -12°C and 3 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 23 kph from the west.

  • -12°C maximum temperature-12
    °C maximum temperature
  • -18°C minimum temperature-18
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 0 cm of snow expected0
    cm of snow expected
  • -21°C wind chill-21
    °C wind chill
  • Moderate breeze of 23 kph from the West23
    kph wind from W

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Thunder Bay weather for Monday 22nd December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -3°C and no hours of bright sunshine. There are 0-2 cm of snow expected with 19% chance of some snow and a light breeze of 7 kph from the east.

  • -3°C maximum temperature-3
    °C maximum temperature
  • -15°C minimum temperature-15
    °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)
  • 19% chance of some snow19
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -6°C wind chill-6
    °C wind chill
  • Light breeze of 7 kph from the East7
    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 -1°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 18% chance of some snow and a moderate breeze of 21 kph from the north-west.

  • -1°C maximum temperature-1
    °C maximum temperature
  • -15°C minimum temperature-15
    °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)
  • 18% chance of some snow18
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -7°C wind chill-7
    °C wind chill
  • Moderate breeze of 21 kph from the North-West21
    kph wind from NW

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Thunder Bay weather for Wednesday 24th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 0°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 cm of snow expected with 14% chance of some snow and a light breeze of 10 kph from the south.

  • 0°C maximum temperature0
    °C maximum temperature
  • -16°C minimum temperature-16
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 14% chance of some snow14
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -3°C wind chill-3
    °C wind chill
  • Light breeze of 10 kph from the South10
    kph wind from S

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

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