S
M
T
W
T
F
S
26
45°
36°
27
45°
36°
28
51°
35°
29
43°
32°
30
43°
26°
1
49°
25°
2
57°
20°
3
65°
32°
4
58°
33°
5
41°
33°
6
44°
32°
7
47°
27°
8
55°
32°
9
55°
31°
10
51°
30°
11
53°
30°
12
53°
34°
13
56°
36°
14
59°
38°
15
58°
35°
16
60°
36°
17
61°
36°
18
62°
40°
19
61°
37°
20
54°
38°
21
56°
39°
22
56°
37°
23
58°
40°
24
60°
40°
25
58°
41°
26
64°
41°
27
66°
43°
28
66°
44°
29
65°
44°
30
67°
46°
31
65°
45°
1
63°
45°
2
66°
46°
3
64°
45°
4
69°
46°
5
60°
43°
6
59°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Thunder Bay Airport
Thunder Bay Airport's May 2026 forecast shows daily high temperatures ranging from 44° to 69°, with overnight lows between 27° and 46°. The average high for May is 59° with an average low of 39°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Thunder Bay Airport. See also: June | July | August.
