Thunder Bay weather live forecast

Tomorrow's maximum temperature in Thunder Bay is expected to be 10°C.

  • Thursday
    1st May
    Broken clouds
  • Friday
    2nd May
    Cloudy with sleet or snow (10-20 mm of rainfall expected)
  • Saturday
    3rd May
    Broken clouds
  • Sunday
    4th May
    Broken clouds
  • Monday
    5th May
    Broken clouds

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 Thursday 1st May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 10°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the east.

  • 10°C maximum temperature10
    °C maximum temperature
  • 2°C minimum temperature2
    °C 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
  • 8°C wind chill8
    °C wind chill
  • Gentle breeze of 16 kph from the East16
    kph 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 7°C, 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 17 kph from the north.

  • 7°C maximum temperature7
    °C maximum temperature
  • 1°C minimum temperature1
    °C 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
  • 4°C wind chill4
    °C wind chill
  • Gentle breeze of 17 kph from the North17
    kph 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 13°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south-west.

  • 13°C maximum temperature13
    °C maximum temperature
  • -1°C minimum temperature-1
    °C 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
  • 13°C wind chill13
    °C wind chill
  • Gentle breeze of 15 kph from the South-West15
    kph 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 11°C, maximum UV of 6 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the east.

  • 11°C maximum temperature11
    °C maximum temperature
  • 3°C minimum temperature3
    °C 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 13 kph from the East13
    kph wind from E

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Thunder Bay weather for Monday 5th May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 15°C, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south.

  • 15°C maximum temperature15
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 15°C wind chill15
    °C wind chill
  • Gentle breeze of 15 kph from the South15
    kph wind from S

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

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