Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 75°F. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

• Saturday
  13th Sep
  75
  57
  
  10
  5
• Sunday
  14th Sep
  63
  54
  
  3
  5
• Monday
  15th Sep
  66
  54
  
  5
  4
• Tuesday
  16th Sep
  73
  55
  
  8
  5
• Wednesday
  17th Sep
  73
  57
  
  5
  4

5-day weather forecast updated at 04:01 on Sunday 14th September 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 13th September 2025

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 75°F, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 4 mph from the south-east.

• 75
  °F maximum temperature
• 57
  °F minimum temperature
• 
  scattered clouds
• 10
  hours of sunshine
• 5
  UV index (Moderate)
• 0
  mm of rainfall expected
• 0
  no heat & humidity
• 4
  mph wind from SE

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Thunder Bay weather for Sunday 14th September 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 63°F, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the east.

• 63
  °F maximum temperature
• 54
  °F minimum temperature
• 
  broken clouds
• 3
  hours of sunshine
• 5
  UV index (Moderate)
• 0
  mm of rainfall expected
• 0
  no heat & humidity
• 8
  mph wind from E

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Thunder Bay weather for Monday 15th September 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 66°F, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the east.

• 66
  °F maximum temperature
• 54
  °F minimum temperature
• 
  broken clouds
• 5
  hours of sunshine
• 4
  UV index (Moderate)
• 0
  mm of rainfall expected
• 0
  no heat & humidity
• 7
  mph wind from E

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Thunder Bay weather for Tuesday 16th September 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 73°F, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-east.

• 73
  °F maximum temperature
• 55
  °F minimum temperature
• 
  broken clouds
• 8
  hours of sunshine
• 5
  UV index (Moderate)
• 0
  mm of rainfall expected
• 0
  no heat & humidity
• 7
  mph wind from SE

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Thunder Bay weather for Wednesday 17th September 2025

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 73°F, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 39% chance of some rain and a light breeze of 6 mph from the south.

• 73
  °F maximum temperature
• 57
  °F minimum temperature
• 
  isolated thunderstorms
• 5
  hours of sunshine
• 4
  UV index (Moderate)
• 39
  % chance of some rain
• <5
  mm of rainfall expected
• 73
  °F wind chill
• 6
  mph wind from S

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