Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 19°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:00 on Monday 28th 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 Monday 28th September 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the north-west.

  • 19°C maximum temperature19
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    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 9 kph from the North-West9
    kph wind from NW

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Thunder Bay weather for Tuesday 29th September 2026

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 82% chance of some rain and a gentle breeze of 16 kph from the south.

  • 18°C maximum temperature18
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 82% chance of some rain82
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 18°C wind chill18
    °C wind chill
  • Gentle breeze of 16 kph from the South16
    kph wind from S

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Thunder Bay weather for Wednesday 30th September 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 21°C, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 23% chance of some rain and a light breeze of 11 kph from the south.

  • 21°C maximum temperature21
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 23% chance of some rain23
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 21°C wind chill21
    °C wind chill
  • Light breeze of 11 kph from the South11
    kph wind from S

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Thunder Bay weather for Thursday 1st October 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the north-west.

  • 18°C maximum temperature18
    °C maximum temperature
  • 8°C minimum temperature8
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    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
  • Moderate breeze of 26 kph from the North-West26
    kph wind from NW

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Thunder Bay weather for Friday 2nd October 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 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 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 17 kph from the West17
    kph wind from W

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