S
M
T
W
T
F
S
27
63°
57°
28
58°
55°
29
70°
55°
30
68°
54°
1
75°
57°
2
88°
63°
3
72°
50°
4
66°
45°
5
72°
44°
6
61°
39°
7
68°
34°
8
75°
52°
9
69°
43°
10
66°
47°
11
63°
55°
12
69°
52°
13
70°
49°
14
63°
39°
15
61°
43°
16
66°
49°
17
64°
45°
18
58°
42°
19
61°
41°
20
62°
42°
21
63°
39°
22
55°
44°
23
55°
34°
24
54°
33°
25
54°
38°
26
61°
42°
27
62°
32°
28
52°
32°
29
51°
31°
30
52°
36°
31
57°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Collinsville
Collinsville's October 2026 forecast shows daily high temperatures ranging from 51° to 70°, with overnight lows between 31° and 55°. The average high for October is 60° with an average low of 41°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Collinsville. See also: November | December | January.
