S
M
T
W
T
F
S
26
80°
50°
27
74°
54°
28
75°
53°
29
79°
50°
30
74°
51°
31
72°
54°
1
72°
53°
2
75°
51°
3
75°
47°
4
71°
49°
5
73°
53°
6
75°
55°
7
74°
55°
8
78°
56°
9
78°
54°
10
78°
55°
11
77°
56°
12
77°
55°
13
78°
56°
14
79°
55°
15
78°
49°
16
76°
53°
17
69°
54°
18
77°
45°
19
76°
54°
20
69°
51°
21
69°
46°
22
Hist. Avg.
71°
47°
23
Hist. Avg.
70°
47°
24
Hist. Avg.
70°
47°
25
Hist. Avg.
70°
47°
26
Hist. Avg.
69°
46°
27
Hist. Avg.
69°
46°
28
Hist. Avg.
69°
46°
29
Hist. Avg.
68°
46°
30
Hist. Avg.
68°
45°
31
Hist. Avg.
67°
45°
1
Hist. Avg.
67°
45°
2
Hist. Avg.
67°
44°
3
Hist. Avg.
66°
44°
4
Hist. Avg.
66°
44°
5
Hist. Avg.
65°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Thunder Bay Airport
Thunder Bay Airport's August 2026 forecast shows daily high temperatures ranging from 69° to 80°, with overnight lows between 45° and 56°. The average high for August is 75° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Thunder Bay Airport. See also: September | October | November.
