S
M
T
W
T
F
S
27
80°
56°
28
83°
55°
29
87°
49°
30
92°
62°
1
90°
69°
2
70°
59°
3
76°
54°
4
82°
56°
5
79°
49°
6
79°
43°
7
87°
48°
8
87°
57°
9
86°
52°
10
82°
49°
11
89°
51°
12
88°
62°
13
89°
65°
14
77°
66°
15
83°
59°
16
59°
47°
17
62°
38°
18
66°
34°
19
71°
35°
20
69°
39°
21
76°
43°
22
78°
43°
23
77°
44°
24
78°
41°
25
76°
43°
26
73°
45°
27
74°
48°
28
80°
51°
29
81°
53°
30
76°
57°
31
69°
58°
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 69° to 81°, with overnight lows between 48° and 58°. The average high for October is 76° with an average low of 53°. 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.
