Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 21°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 Tuesday 9th June 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 Tuesday 9th June 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a light breeze of 11 kph from the east.

  • 21°C maximum temperature21
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 12% chance of some rain12
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 11 kph from the East11
    kph wind from E

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Thunder Bay weather for Wednesday 10th June 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 93% chance of some rain and a gentle breeze of 16 kph from the east.

  • 17°C maximum temperature17
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 93% chance of some rain93
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 16 kph from the East16
    kph wind from E

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Thunder Bay weather for Thursday 11th June 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 25°C, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 2-5 mm of rainfall expected with 35% chance of some rain and a moderate breeze of 21 kph from the south-west.

  • 25°C maximum temperature25
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 35% chance of some rain35
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 21 kph from the South-West21
    kph wind from SW

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Thunder Bay weather for Friday 12th June 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the west.

  • 22°C maximum temperature22
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 23 kph from the West23
    kph wind from W

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Thunder Bay weather for Saturday 13th June 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the north-west.

  • 18°C maximum temperature18
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Broken clouds
    broken 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
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 21 kph from the North-West21
    kph wind from NW

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