Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 7°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Monday
    27th Apr
    Mostly cloudy with rain (10-20 mm of rainfall expected)
  • Tuesday
    28th Apr
    Mostly cloudy with light rain (0-2 mm of rainfall expected)
  • Wednesday
    29th Apr
    Broken clouds
  • Thursday
    30th Apr
    Broken clouds
  • Friday
    1st May
    Scattered clouds

5-day weather forecast updated at 04:00 on Monday 27th April 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 Monday 27th April 2026

Expect mostly cloudy with rain 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 rainfall expected with 99% chance of some rain and a moderate breeze of 21 kph from the east.

  • 7°C maximum temperature7
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 99% chance of some rain99
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 4°C wind chill4
    °C wind chill
  • Moderate breeze of 21 kph from the East21
    kph wind from E

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Thunder Bay weather for Tuesday 28th April 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 10°C, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 21% chance of some rain and a fresh breeze of 29 kph from the north-west.

  • 10°C maximum temperature10
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 21% chance of some rain21
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 6°C wind chill6
    °C wind chill
  • Fresh breeze of 29 kph from the North-West29
    kph wind from NW

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Thunder Bay weather for Wednesday 29th April 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 8°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-west.

  • 8°C maximum temperature8
    °C maximum temperature
  • 0°C minimum temperature0
    °C 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
  • 6°C wind chill6
    °C wind chill
  • Light breeze of 12 kph from the North-West12
    kph wind from NW

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Thunder Bay weather for Thursday 30th April 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the north.

  • 7°C maximum temperature7
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 5°C wind chill5
    °C wind chill
  • Light breeze of 10 kph from the North10
    kph wind from N

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Thunder Bay weather for Friday 1st May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 8°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the north-west.

  • 8°C maximum temperature8
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 7°C wind chill7
    °C wind chill
  • Light breeze of 11 kph from the North-West11
    kph wind from NW

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