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Thunder Bay weather live forecast
Today's maximum temperature in Thunder Bay is expected to be 81°F. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.
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Monday
11th Aug -
Tuesday
12th Aug -
Wednesday
13th Aug -
Thursday
14th Aug -
Friday
15th Aug
5-day weather forecast updated at 04:00 on Sunday 10th August 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 Monday 11th August 2025
Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 9 mph from the south-west.
- °F maximum temperature
- °F minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (Moderate)
- % chance of some rain
- mm of rainfall expected
- low heat & humidity
- mph wind from SW
Thunder Bay weather for Tuesday 12th August 2025
Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 79°F, low levels of heat & humidity, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 38% chance of some rain and a moderate breeze of 13 mph from the west.
- °F maximum temperature
- °F minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (High)
- % chance of some rain
- mm of rainfall expected
- low heat & humidity
- mph wind from W
Thunder Bay weather for Wednesday 13th August 2025
Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 72°F, maximum UV of 4 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north-west.
- °F maximum temperature
- °F minimum temperature
- broken clouds
- hours of sunshine
- UV index (Moderate)
- mm of rainfall expected
- no heat & humidity
- mph wind from NW
Thunder Bay weather for Thursday 14th August 2025
Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 68°F, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 32% chance of some rain and a gentle breeze of 12 mph from the south-east.
- °F maximum temperature
- °F minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (High)
- % chance of some rain
- mm of rainfall expected
- no heat & humidity
- mph wind from SE
Thunder Bay weather for Friday 15th August 2025
Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 79°F, low levels of heat & humidity, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 10-20 mm of rainfall expected with 54% chance of some rain and a gentle breeze of 11 mph from the south-west.
- °F maximum temperature
- °F minimum temperature
- isolated thunderstorms
- hours of sunshine
- UV index (Moderate)
- % chance of some rain
- mm of rainfall expected
- low heat & humidity
- mph wind from SW
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Metric (°C) | Imperial (°F)
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