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July is the hottest month in Thunder Bay with an average temperature of 19°C (66°F) and the coldest is January at -13°C (8°F). The wettest month is June with an average of 80mm of rain..
Average Temperature Thunder Bay
What is Average Temperature?
The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month
The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month
What is Average Temperature?
The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month
The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month
Average High Low Temperature Thunder Bay
What is Average High Low Temperature?
The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily
The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily
What is Average High Low Temperature?
The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily
The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily
Average Rainfall Thunder Bay
What is Average Rainfall?
The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years
The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years
What is Average Rainfall?
The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years
The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years
More Annual Averages
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Thunder Bay : Next 24-Hour Weather
Tomorrow - 18th August 2026
Sunrise 06:55
Sunset 21:06
21:00
20°C
(67°F)
22:00
18°C
(64°F)
23:00
17°C
(61°F)
Tomorrow - 19th August 2026
Sunrise 06:55
Sunset 21:06
0:00
16°C
(60°F)
1:00
15°C
(58°F)
2:00
14°C
(56°F)
3:00
13°C
(55°F)
4:00
12°C
(54°F)
5:00
12°C
(53°F)
6:00
13°C
(54°F)
7:00
12°C
(53°F)
8:00
12°C
(53°F)
9:00
12°C
(52°F)
10:00
14°C
(56°F)
11:00
15°C
(59°F)
12:00
16°C
(60°F)
13:00
15°C
(59°F)
14:00
17°C
(62°F)
15:00
18°C
(63°F)
16:00
17°C
(61°F)
17:00
16°C
(60°F)
18:00
16°C
(60°F)
19:00
16°C
(60°F)
20:00
16°C
(60°F)
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Thunder Bay
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