S
M
T
W
T
F
S
27
75°
58°
28
82°
55°
29
86°
50°
30
95°
64°
1
93°
71°
2
74°
56°
3
78°
50°
4
83°
48°
5
79°
50°
6
80°
45°
7
89°
48°
8
86°
51°
9
89°
49°
10
83°
51°
11
87°
50°
12
92°
64°
13
94°
72°
14
77°
68°
15
81°
52°
16
61°
37°
17
61°
40°
18
67°
47°
19
70°
52°
20
73°
53°
21
72°
54°
22
72°
51°
23
65°
49°
24
66°
44°
25
65°
42°
26
70°
43°
27
66°
41°
28
59°
36°
29
57°
40°
30
62°
43°
31
68°
46°
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 57° to 94°, with overnight lows between 36° and 72°. The average high for October is 70° with an average low of 49°. 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.
