S
M
T
W
T
F
S
28
71°
54°
29
63°
54°
30
73°
53°
1
87°
52°
2
85°
54°
3
80°
57°
4
78°
53°
5
78°
48°
6
79°
46°
7
87°
56°
8
82°
55°
9
82°
52°
10
82°
51°
11
78°
51°
12
83°
57°
13
103°
63°
14
96°
68°
15
79°
63°
16
74°
59°
17
68°
60°
18
80°
55°
19
83°
52°
20
86°
59°
21
68°
51°
22
76°
51°
23
85°
55°
24
80°
53°
25
86°
60°
26
76°
55°
27
76°
54°
28
82°
51°
29
88°
54°
30
76°
61°
31
86°
63°
1
80°
56°
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 ° to °, with overnight lows between ° and °. The average high for July is ° with an average low of °. 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.
