Thunder Bay 7-day weather forecast

Written by:
June 8, 2026
ESOlex // Shutterstock

Thunder Bay 7-day weather forecast

Stacker created the forecast for Thunder Bay, Ontario using data from OpenWeather. This week's high is 28 °C on Monday, while the low is 11 °C on Wednesday. There are expected to be 3 sunny days and rain on 5 days this week.

Environment Canada, the Province of Ontario has issued an air quality until Monday at 05:59 PM.

Monday, July 20

- High of 28 °C, low of 16 °C (48% humidity)
- Partly cloudy with a 100% chance of rain (10 mm of rain)
- High risk of harm from sun exposure (7 UV index)
- Light breeze (22 km/h wind)
- Sunrise at 6:16 AM, sunset at 9:49 PM
1 / 6
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Tuesday, July 21

- High of 20 °C, low of 14 °C (67% humidity)
- Overcast with a 61% chance of rain (0 mm of rain)
- High risk of harm from sun exposure (6 UV index)
- Gentle breeze (28 km/h wind)
- Sunrise at 6:18 AM, sunset at 9:48 PM
- First quarter moon
2 / 6
Leonid Ikan // Shutterstock

Wednesday, July 22

- High of 23 °C, low of 11 °C (34% humidity)
- Fair with a 0% chance of snow
- High risk of harm from sun exposure (6 UV index)
- Light breeze (19 km/h wind)
- Sunrise at 6:19 AM, sunset at 9:47 PM
3 / 6
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Thursday, July 23

- High of 25 °C, low of 16 °C (38% humidity)
- Sunny with a 0% chance of snow
- High risk of harm from sun exposure (6 UV index)
- Light breeze (14 km/h wind)
- Sunrise at 6:20 AM, sunset at 9:46 PM
4 / 6
Leonid Ikan // Shutterstock

Friday, July 24

- High of 18 °C, low of 13 °C (69% humidity)
- Partly cloudy with a 100% chance of rain (1 mm of rain)
- Light breeze (14 km/h wind)
- Sunrise at 6:21 AM, sunset at 9:44 PM
5 / 6
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Saturday, July 25

- High of 24 °C, low of 13 °C (53% humidity)
- Mostly cloudy with a 65% chance of rain (1 mm of rain)
- Light breeze (26 km/h wind)
- Sunrise at 6:22 AM, sunset at 9:43 PM
6 / 6
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Sunday, July 26

- High of 25 °C, low of 16 °C (59% humidity)
- Sunny with a 100% chance of rain (14 mm of rain)
- Light breeze (16 km/h wind)
- Sunrise at 6:24 AM, sunset at 9:42 PM

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