Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 9°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Thursday
    23rd Apr
    Isolated thunderstorms (5-10 mm of rainfall expected)
  • Friday
    24th Apr
    Cloudy with some rain (20-30 mm of rainfall expected)
  • Saturday
    25th Apr
    Scattered clouds
  • Sunday
    26th Apr
    Broken clouds
  • Monday
    27th Apr
    Mostly cloudy with light rain (0-2 mm of rainfall expected)

5-day weather forecast updated at 04:00 on Thursday 23rd 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 Thursday 23rd April 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 9°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 85% chance of some rain and a moderate breeze of 23 kph from the east.

  • 9°C maximum temperature9
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 85% chance of some rain85
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 6°C wind chill6
    °C wind chill
  • Moderate breeze of 23 kph from the East23
    kph wind from E

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Thunder Bay weather for Friday 24th April 2026

Expect cloudy with some rain in Thunder Bay, Ontario with a maximum temperature of 9°C, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 20-30 mm of rainfall expected with 92% chance of some rain and a moderate breeze of 20 kph from the east.

  • 9°C maximum temperature9
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Cloudy with some rain
    cloudy with some rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 92% chance of some rain92
    % chance of some rain
  • 20-30 mm of rainfall expected<30
    mm of rainfall expected
  • 6°C wind chill6
    °C wind chill
  • Moderate breeze of 20 kph from the East20
    kph wind from E

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Thunder Bay weather for Saturday 25th April 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 14°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the north-west.

  • 14°C maximum temperature14
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 14°C wind chill14
    °C wind chill
  • Gentle breeze of 13 kph from the North-West13
    kph wind from NW

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Thunder Bay weather for Sunday 26th April 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 12°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the east.

  • 12°C maximum temperature12
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 10 kph from the East10
    kph wind from E

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Thunder Bay weather for Monday 27th April 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 59% 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 light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 59% chance of some rain59
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    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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