S
M
T
W
T
F
S
27
80°
55°
28
79°
54°
29
80°
54°
30
79°
52°
1
76°
54°
2
78°
54°
3
79°
52°
4
78°
45°
5
70°
43°
6
71°
44°
7
72°
44°
8
76°
50°
9
71°
51°
10
69°
48°
11
Hist. Avg.
71°
44°
12
Hist. Avg.
70°
43°
13
Hist. Avg.
70°
43°
14
Hist. Avg.
70°
42°
15
Hist. Avg.
70°
42°
16
Hist. Avg.
70°
42°
17
Hist. Avg.
69°
41°
18
Hist. Avg.
69°
41°
19
Hist. Avg.
69°
41°
20
Hist. Avg.
69°
40°
21
Hist. Avg.
68°
40°
22
Hist. Avg.
68°
40°
23
Hist. Avg.
68°
39°
24
Hist. Avg.
68°
39°
25
Hist. Avg.
68°
39°
26
Hist. Avg.
67°
38°
27
Hist. Avg.
67°
38°
28
Hist. Avg.
67°
38°
29
Hist. Avg.
66°
38°
30
Hist. Avg.
66°
37°
31
Hist. Avg.
66°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
October Weather in Collinsville
Collinsville's October 2026 forecast shows daily high temperatures ranging from 69° to 80°, with overnight lows between 43° and 55°. The average high for October is 76° with an average low of 50°. 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.
