S
M
T
W
T
F
S
28
67°
47°
29
71°
47°
30
74°
50°
1
75°
50°
2
74°
42°
3
70°
50°
4
73°
45°
5
69°
48°
6
68°
53°
7
70°
53°
8
77°
49°
9
69°
45°
10
72°
51°
11
75°
48°
12
73°
46°
13
68°
52°
14
76°
55°
15
77°
55°
16
79°
52°
17
71°
46°
18
73°
46°
19
75°
49°
20
74°
49°
21
73°
50°
22
71°
44°
23
72°
44°
24
72°
48°
25
74°
51°
26
75°
54°
27
76°
53°
28
69°
57°
29
78°
55°
30
79°
56°
31
79°
56°
1
75°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Thunder Bay
Thunder Bay's July 2026 forecast shows daily high temperatures ranging from 67° to 79°, with overnight lows between 42° and 57°. The average high for July is 73° with an average low of 50°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Thunder Bay. See also: August | September | October.
