S
M
T
W
T
F
S
28
72°
66°
29
84°
68°
30
88°
64°
1
97°
73°
2
97°
70°
3
99°
73°
4
97°
72°
5
91°
64°
6
86°
68°
7
81°
70°
8
81°
70°
9
86°
70°
10
81°
66°
11
82°
63°
12
82°
64°
13
82°
57°
14
90°
61°
15
95°
72°
16
95°
68°
17
92°
71°
18
81°
70°
19
86°
63°
20
85°
70°
21
87°
66°
22
83°
63°
23
84°
64°
24
81°
64°
25
83°
66°
26
85°
65°
27
83°
66°
28
81°
65°
29
87°
63°
30
81°
67°
31
88°
69°
1
88°
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 81° to 95°, with overnight lows between 63° and 72°. The average high for July is 86° with an average low of 67°. 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.
