Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 15°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Sunday
    3rd May
    Broken clouds
  • Monday
    4th May
    Mostly cloudy with light rain (2-5 mm of rainfall expected)
  • Tuesday
    5th May
    Broken clouds
  • Wednesday
    6th May
    Broken clouds
  • Thursday
    7th May
    Mostly cloudy with light rain (0-2 mm of rainfall expected)

5-day weather forecast updated at 04:00 on Sunday 3rd May 2026 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 3rd May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 15°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the west.

  • 15°C maximum temperature15
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 15°C wind chill15
    °C wind chill
  • Gentle breeze of 19 kph from the West19
    kph wind from W

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Thunder Bay weather for Monday 4th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 11°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 49% chance of some rain and a moderate breeze of 28 kph from the west.

  • 11°C maximum temperature11
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 49% chance of some rain49
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 28 kph from the West28
    kph wind from W

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Thunder Bay weather for Tuesday 5th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 5°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the north-west.

  • 5°C maximum temperature5
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 2°C wind chill2
    °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 6th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north-west.

  • 6°C maximum temperature6
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 2°C wind chill2
    °C wind chill
  • Gentle breeze of 16 kph from the North-West16
    kph wind from NW

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Thunder Bay weather for Thursday 7th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 39% chance of some rain and a light breeze of 11 kph from the north-west.

  • 7°C maximum temperature7
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 39% chance of some rain39
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 5°C wind chill5
    °C wind chill
  • Light breeze of 11 kph from the North-West11
    kph wind from NW

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