Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 52°F. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:00 on Sunday 19th October 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 19th October 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 52°F, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 12 mph from the north-west.

  • 52°F maximum temperature52
    °F maximum temperature
  • 37°F minimum temperature37
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 12 mph from the North-West12
    mph wind from NW

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Thunder Bay weather for Monday 20th October 2025

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 52°F, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 71% chance of some rain and a moderate breeze of 16 mph from the south-east.

  • 52°F maximum temperature52
    °F maximum temperature
  • 34°F minimum temperature34
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 71% chance of some rain71
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 52°F wind chill52
    °F wind chill
  • Moderate breeze of 16 mph from the South-East16
    mph wind from SE

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Thunder Bay weather for Tuesday 21st October 2025

Expect cloudy with some rain in Thunder Bay, Ontario with a maximum temperature of 48°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 20-30 mm of rainfall expected with 70% chance of some rain and a moderate breeze of 14 mph from the north-east.

  • 48°F maximum temperature48
    °F maximum temperature
  • 39°F minimum temperature39
    °F minimum temperature
  • Cloudy with some rain
    cloudy with some rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 70% chance of some rain70
    % chance of some rain
  • 20-30 mm of rainfall expected<30
    mm of rainfall expected
  • 43°F wind chill43
    °F wind chill
  • Moderate breeze of 14 mph from the North-East14
    mph wind from NE

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Thunder Bay weather for Wednesday 22nd October 2025

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 45°F and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 55% chance of some rain and a moderate breeze of 14 mph from the north-west.

  • 45°F maximum temperature45
    °F maximum temperature
  • 36°F minimum temperature36
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • No hours of bright sunshine0
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 55% chance of some rain55
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 37°F wind chill37
    °F wind chill
  • Moderate breeze of 14 mph from the North-West14
    mph wind from NW

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Thunder Bay weather for Thursday 23rd October 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 45°F, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 12 mph from the north-west.

  • 45°F maximum temperature45
    °F maximum temperature
  • 32°F minimum temperature32
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 37°F wind chill37
    °F wind chill
  • Gentle breeze of 12 mph from the North-West12
    mph wind from NW

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