Thunder Bay weather live forecast

Tomorrow's maximum temperature in Thunder Bay is expected to be 73°F.

5-day weather forecast updated at 04:00 on Tuesday 15th 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 Tuesday 15th July 2025

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 73°F, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 67% chance of some rain and a gentle breeze of 10 mph from the east.

  • 73°F maximum temperature73
    °F maximum temperature
  • 59°F minimum temperature59
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 67% chance of some rain67
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 73°F wind chill73
    °F wind chill
  • Gentle breeze of 10 mph from the East10
    mph wind from E

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Thunder Bay weather for Wednesday 16th July 2025

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 68°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 30% chance of some rain and a gentle breeze of 11 mph from the north.

  • 68°F maximum temperature68
    °F maximum temperature
  • 55°F minimum temperature55
    °F 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)
  • 30% chance of some rain30
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 11 mph from the North11
    mph wind from N

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Thunder Bay weather for Thursday 17th July 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 75°F, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-west.

  • 75°F maximum temperature75
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 75°F wind chill75
    °F wind chill
  • Light breeze of 7 mph from the South-West7
    mph wind from SW

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Thunder Bay weather for Friday 18th July 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 73°F, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south.

  • 73°F maximum temperature73
    °F maximum temperature
  • 57°F minimum temperature57
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 73°F wind chill73
    °F wind chill
  • Gentle breeze of 9 mph from the South9
    mph wind from S

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Thunder Bay weather for Saturday 19th July 2025

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 70°F, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 51% chance of some rain and a light breeze of 7 mph from the east.

  • 70°F maximum temperature70
    °F maximum temperature
  • 57°F minimum temperature57
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 51% chance of some rain51
    % 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 East7
    mph wind from E

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