S
M
T
W
T
F
S
27
72°
49°
28
72°
48°
29
73°
49°
30
71°
49°
1
69°
59°
2
63°
42°
3
61°
40°
4
67°
40°
5
55°
32°
6
58°
30°
7
71°
43°
8
62°
39°
9
64°
36°
10
60°
37°
11
60°
46°
12
69°
53°
13
80°
56°
14
56°
47°
15
50°
46°
16
62°
37°
17
48°
32°
18
61°
30°
19
66°
35°
20
63°
35°
21
62°
31°
22
64°
35°
23
56°
32°
24
60°
37°
25
64°
49°
26
58°
32°
27
49°
33°
28
54°
46°
29
65°
41°
30
58°
39°
31
53°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Alton
Alton's October 2026 forecast shows daily high temperatures ranging from 49° to 65°, with overnight lows between 32° and 49°. The average high for October is 58° with an average low of 39°. 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 Alton. See also: November | December | January.
