S
M
T
W
T
F
S
28
94°
78°
29
94°
79°
30
92°
75°
1
92°
76°
2
93°
74°
3
94°
76°
4
97°
68°
5
86°
68°
6
95°
72°
7
95°
74°
8
98°
77°
9
98°
77°
10
96°
78°
11
97°
76°
12
92°
75°
13
93°
74°
14
93°
76°
15
98°
73°
16
99°
76°
17
101°
76°
18
98°
77°
19
99°
76°
20
95°
73°
21
99°
78°
22
99°
77°
23
98°
78°
24
98°
77°
25
97°
77°
26
98°
76°
27
98°
77°
28
97°
77°
29
98°
76°
30
98°
77°
31
97°
78°
1
97°
77°
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 92° to 101°, with overnight lows between 73° and 78°. The average high for July is 97° with an average low of 76°. 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.
