Thunder Bay weather live forecast

Tomorrow's maximum temperature in Thunder Bay is expected to be 72°F.

5-day weather forecast updated at 04:00 on Saturday 5th July 2025 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 Saturday 5th July 2025

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 72°F, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 20-30 mm of rainfall expected with 99% chance of some rain and a gentle breeze of 9 mph from the north.

  • 72°F maximum temperature72
    °F maximum temperature
  • 57°F minimum temperature57
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 99% chance of some rain99
    % chance of some rain
  • 20-30 mm of rainfall expected<30
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 9 mph from the North9
    mph wind from N

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Thunder Bay weather for Sunday 6th July 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 72°F, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 12 mph from the north.

  • 72°F maximum temperature72
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 72°F wind chill72
    °F wind chill
  • Gentle breeze of 12 mph from the North12
    mph wind from N

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Thunder Bay weather for Monday 7th July 2025

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 70°F, maximum UV of 6 (High) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a light breeze of 7 mph from the south-east.

  • 70°F maximum temperature70
    °F maximum temperature
  • 52°F minimum temperature52
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 25% chance of some rain25
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 70°F wind chill70
    °F wind chill
  • Light breeze of 7 mph from the South-East7
    mph wind from SE

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Thunder Bay weather for Tuesday 8th July 2025

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 68°F, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 40% chance of some rain and a light breeze of 7 mph from the south-east.

  • 68°F maximum temperature68
    °F maximum temperature
  • 52°F minimum temperature52
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 40% chance of some rain40
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 7 mph from the South-East7
    mph wind from SE

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Thunder Bay weather for Wednesday 9th July 2025

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 73°F, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 22% chance of some rain and a light breeze of 6 mph from the south-east.

  • 73°F maximum temperature73
    °F maximum temperature
  • 52°F minimum temperature52
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 22% chance of some rain22
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 73°F wind chill73
    °F wind chill
  • Light breeze of 6 mph from the South-East6
    mph wind from SE

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