Thunder Bay 7-day weather forecast

Written by:
June 8, 2026
ESOlex // Shutterstock

Thunder Bay 7-day weather forecast

created the forecast for Thunder Bay, Ontario using data from . This week's high is 26 掳C on Thursday, while the low is 11 掳C on Wednesday. There are expected to be 3 sunny days and rain on 4 days this week.

There are currently no weather alerts.

Monday, August 3

- High of 22 掳C, low of 12 掳C (62% humidity)
- Partly sunny with a 0% chance of snow
- High risk of harm from sun exposure (7 UV index)
- Light breeze (14 km/h wind)
- Sunrise at 6:34 AM, sunset at 9:31 PM
1 / 6
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Tuesday, August 4

- High of 24 掳C, low of 13 掳C (45% humidity)
- Partly cloudy with a 100% chance of rain (6 mm of rain)
- High risk of harm from sun exposure (6 UV index)
- Light breeze (21 km/h wind)
- Sunrise at 6:35 AM, sunset at 9:30 PM
2 / 6
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Wednesday, August 5

- High of 22 掳C, low of 11 掳C (40% humidity)
- Fair with a 0% chance of snow
- High risk of harm from sun exposure (6 UV index)
- Light breeze (20 km/h wind)
- Sunrise at 6:37 AM, sunset at 9:28 PM
- Last quarter moon
3 / 6
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Thursday, August 6

- High of 26 掳C, low of 12 掳C (48% humidity)
- Sunny with a 0% chance of snow
- High risk of harm from sun exposure (6 UV index)
- Light breeze (25 km/h wind)
- Sunrise at 6:38 AM, sunset at 9:27 PM
4 / 6
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Friday, August 7

- High of 22 掳C, low of 15 掳C (58% humidity)
- Overcast with a 20% chance of rain (0 mm of rain)
- Light breeze (17 km/h wind)
- Sunrise at 6:39 AM, sunset at 9:25 PM
5 / 6
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Saturday, August 8

- High of 20 掳C, low of 14 掳C (97% humidity)
- Mostly cloudy with a 100% chance of rain (6 mm of rain)
- Light air (12 km/h wind)
- Sunrise at 6:41 AM, sunset at 9:23 PM
6 / 6
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Sunday, August 9

- High of 23 掳C, low of 13 掳C (38% humidity)
- Sunny with a 100% chance of rain (3 mm of rain)
- Light breeze (18 km/h wind)
- Sunrise at 6:42 AM, sunset at 9:22 PM

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