Thunder Bay weather live forecast

Tomorrow's maximum temperature in Thunder Bay is expected to be 41°F.

5-day weather forecast updated at 04:00 on Thursday 1st May 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 Wednesday 30th April 2025

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 41°F, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a gentle breeze of 11 mph from the south-east.

  • 41°F maximum temperature41
    °F maximum temperature
  • 21°F minimum temperature21
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 12% chance of some rain12
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 36°F wind chill36
    °F wind chill
  • Gentle breeze of 11 mph from the South-East11
    mph wind from SE

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Thunder Bay weather for Thursday 1st May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 50°F, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the east.

  • 50°F maximum temperature50
    °F maximum temperature
  • 36°F minimum temperature36
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 46°F wind chill46
    °F wind chill
  • Gentle breeze of 10 mph from the East10
    mph wind from E

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Thunder Bay weather for Friday 2nd May 2025

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 45°F, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 10-20 mm of sleet/snow expected with 69% chance of some sleet or snow and a gentle breeze of 11 mph from the north.

  • 45°F maximum temperature45
    °F maximum temperature
  • 34°F minimum temperature34
    °F minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 69% chance of some sleet or snow69
    % chance of some sleet or snow
  • 10-20 mm of sleet/snow expected<20
    mm of sleet/snow expected
  • 39°F wind chill39
    °F wind chill
  • Gentle breeze of 11 mph from the North11
    mph wind from N

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Thunder Bay weather for Saturday 3rd May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 55°F, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south-west.

  • 55°F maximum temperature55
    °F maximum temperature
  • 30°F minimum temperature30
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 55°F wind chill55
    °F wind chill
  • Gentle breeze of 9 mph from the South-West9
    mph wind from SW

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Thunder Bay weather for Sunday 4th May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 52°F, maximum UV of 6 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the east.

  • 52°F maximum temperature52
    °F maximum temperature
  • 37°F minimum temperature37
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 8 mph from the East8
    mph wind from E

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