Thunder Bay Weather Year-Round — Best Time to Visit
Thunder Bay, Canada has cold weather year-round. The best time to visit is August (score: 82/100). Annual average high: 7.6°C, total rainfall: 655mm.
When is the best time to visit Thunder Bay?
82
August is the best month to visit Thunder Bay with a travel score of 82/100 (Excellent).
Expect highs of 22.3°C, 9 rain days, and 11.5 hours of daily sunshine.
View August weather details →Travel Score by Month
43
Jan
48
Feb
50
Mar
59
Apr
67
May
75
Jun
81
Jul
82
Aug
73
Sep
57
Oct
46
Nov
38
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Thunder Bay each month?
7.6°C
Avg High
0.6°C
Avg Low
655mm
Annual Rain
How much rain does Thunder Bay get?
Thunder Bay receives 655mm of rain annually. The wettest month is typically September with 80mm, while February is the driest.
What is the weather like each month in Thunder Bay?
January
43
-9°C
Low: -16°C
6 rain days
Mixed
February
48
-8°C
Low: -15°C
5 rain days
Mixed
March
50
-1°C
Low: -8°C
6 rain days
Mixed
April
59
5°C
Low: -2°C
9 rain days
Mixed
May
67
13°C
Low: 4°C
10 rain days
Good
June
75
19°C
Low: 11°C
10 rain days
Good
July
81
23°C
Low: 15°C
10 rain days
Excellent
August
Best time to visit82
22°C
Low: 15°C
9 rain days
Excellent
September
73
18°C
Low: 12°C
10 rain days
Good
October
57
10°C
Low: 5°C
10 rain days
Mixed
November
46
3°C
Low: -2°C
7 rain days
Mixed
December
38
-4°C
Low: -11°C
7 rain days
Poor
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Data based on 1994–2024 averages · Last updated: 2024-12-31