Thunder Bay weather live forecast

Tomorrow's maximum temperature in Thunder Bay is expected to be 13°C.

  • Saturday
    24th May
    Mostly cloudy with light rain (0-2 mm of rainfall expected)
  • Sunday
    25th May
    Broken clouds
  • Monday
    26th May
    Scattered clouds
  • Tuesday
    27th May
    Broken clouds
  • Wednesday
    28th May
    Broken clouds

5-day weather forecast updated at 04:00 on Saturday 24th 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 Saturday 24th May 2025

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 13°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 40% chance of some rain and a light breeze of 8 kph from the north.

  • 13°C maximum temperature13
    °C maximum temperature
  • 4°C minimum temperature4
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 40% chance of some rain40
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 13°C wind chill13
    °C wind chill
  • Light breeze of 8 kph from the North8
    kph wind from N

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Thunder Bay weather for Sunday 25th May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 16°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the north-west.

  • 16°C maximum temperature16
    °C maximum temperature
  • 5°C minimum temperature5
    °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
  • 16°C wind chill16
    °C wind chill
  • Light breeze of 8 kph from the North-West8
    kph wind from NW

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Thunder Bay weather for Monday 26th May 2025

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 6 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

  • 17°C maximum temperature17
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 14 hours of bright sunshine14
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 17°C wind chill17
    °C wind chill
  • Light breeze of 11 kph from the South-East11
    kph wind from SE

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Thunder Bay weather for Tuesday 27th May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south-east.

  • 17°C maximum temperature17
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 17°C wind chill17
    °C wind chill
  • Light breeze of 10 kph from the South-East10
    kph wind from SE

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Thunder Bay weather for Wednesday 28th May 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the south-east.

  • 17°C maximum temperature17
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    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
  • Light breeze of 8 kph from the South-East8
    kph wind from SE

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

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