S
M
T
W
T
F
S
26
78°
55°
27
79°
55°
28
80°
54°
29
79°
55°
30
80°
56°
31
79°
55°
1
78°
56°
2
75°
56°
3
78°
55°
4
80°
55°
5
80°
53°
6
79°
54°
7
79°
47°
8
71°
48°
9
68°
49°
10
74°
51°
11
75°
53°
12
76°
52°
13
76°
53°
14
75°
53°
15
71°
54°
16
75°
49°
17
76°
46°
18
69°
51°
19
67°
55°
20
76°
52°
21
76°
52°
22
69°
51°
23
73°
49°
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 67° to 80°, with overnight lows between 46° and 56°. The average high for August is 76° with an average low of 53°. 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.
