S
M
T
W
T
F
S
27
88°
63°
28
85°
62°
29
84°
61°
30
85°
60°
1
83°
61°
2
85°
64°
3
78°
55°
4
80°
61°
5
77°
57°
6
76°
61°
7
Hist. Avg.
77°
57°
8
Hist. Avg.
77°
57°
9
Hist. Avg.
77°
57°
10
Hist. Avg.
76°
56°
11
Hist. Avg.
76°
56°
12
Hist. Avg.
76°
56°
13
Hist. Avg.
76°
56°
14
Hist. Avg.
75°
55°
15
Hist. Avg.
75°
55°
16
Hist. Avg.
75°
55°
17
Hist. Avg.
74°
54°
18
Hist. Avg.
74°
54°
19
Hist. Avg.
74°
54°
20
Hist. Avg.
73°
53°
21
Hist. Avg.
73°
53°
22
Hist. Avg.
73°
53°
23
Hist. Avg.
72°
52°
24
Hist. Avg.
72°
52°
25
Hist. Avg.
72°
52°
26
Hist. Avg.
71°
52°
27
Hist. Avg.
71°
51°
28
Hist. Avg.
71°
51°
29
Hist. Avg.
70°
51°
30
Hist. Avg.
70°
50°
31
Hist. Avg.
70°
50°
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 76° to 88°, with overnight lows between 55° and 64°. The average high for October is 82° with an average low of 61°. 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.
