Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 17°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Thursday
    24th Sep
    Mostly cloudy with light rain (0-2 mm of rainfall expected)
  • Friday
    25th Sep
    Broken clouds
  • Saturday
    26th Sep
    Broken clouds
  • Sunday
    27th Sep
    Broken clouds
  • Monday
    28th Sep
    Broken clouds

5-day weather forecast updated at 04:00 on Thursday 24th September 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 24th September 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 14 kph from the south.

  • 17°C maximum temperature17
    °C maximum temperature
  • 6°C minimum temperature6
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 25% chance of some rain25
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 17°C wind chill17
    °C wind chill
  • Gentle breeze of 14 kph from the South14
    kph wind from S

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Thunder Bay weather for Friday 25th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the south-east.

  • 18°C maximum temperature18
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 7 kph from the South-East7
    kph wind from SE

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Thunder Bay weather for Saturday 26th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the east.

  • 18°C maximum temperature18
    °C maximum temperature
  • 8°C minimum temperature8
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 12 kph from the East12
    kph wind from E

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Thunder Bay weather for Sunday 27th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south.

  • 18°C maximum temperature18
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 18°C wind chill18
    °C wind chill
  • Light breeze of 11 kph from the South11
    kph wind from S

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Thunder Bay weather for Monday 28th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the south.

  • 18°C maximum temperature18
    °C maximum temperature
  • 6°C minimum temperature6
    °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
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 9 kph from the South9
    kph wind from S

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