S
M
T
W
T
F
S
31
78°
65°
1
83°
65°
2
83°
60°
3
80°
56°
4
83°
60°
5
85°
63°
6
85°
67°
7
80°
69°
8
82°
70°
9
79°
68°
10
81°
67°
11
84°
66°
12
86°
70°
13
85°
69°
14
84°
68°
15
85°
69°
16
84°
70°
17
81°
61°
18
86°
66°
19
87°
67°
20
90°
68°
21
87°
67°
22
87°
68°
23
86°
68°
24
87°
67°
25
87°
68°
26
88°
68°
27
88°
67°
28
86°
68°
29
86°
68°
30
82°
67°
1
83°
66°
2
82°
65°
3
82°
63°
4
83°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Collinsville
Collinsville's June 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 56° and 70°. The average high for June is 84° 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 June weather will actually feel in Collinsville. See also: July | August | September.
