S
M
T
W
T
F
S
28
84°
66°
29
86°
66°
30
90°
69°
1
98°
70°
2
99°
67°
3
99°
67°
4
100°
69°
5
95°
66°
6
93°
64°
7
91°
68°
8
89°
69°
9
91°
67°
10
86°
69°
11
88°
68°
12
76°
65°
13
76°
62°
14
85°
64°
15
91°
67°
16
94°
68°
17
90°
67°
18
87°
66°
19
90°
66°
20
87°
67°
21
88°
66°
22
87°
67°
23
88°
65°
24
91°
67°
25
89°
65°
26
84°
62°
27
86°
63°
28
89°
67°
29
88°
67°
30
83°
66°
31
87°
65°
1
87°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Collinsville
Collinsville's July 2026 forecast shows daily high temperatures ranging from 76° to 94°, with overnight lows between 62° and 69°. The average high for July is 87° with an average low of 66°. 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 Collinsville. See also: August | September | October.
