S
M
T
W
T
F
S
27
75°
56°
28
81°
53°
29
83°
48°
30
92°
64°
1
91°
67°
2
74°
55°
3
77°
48°
4
82°
45°
5
77°
46°
6
77°
42°
7
88°
49°
8
84°
47°
9
88°
48°
10
82°
53°
11
85°
47°
12
92°
60°
13
92°
65°
14
80°
67°
15
81°
56°
16
58°
49°
17
59°
39°
18
64°
38°
19
69°
42°
20
70°
43°
21
72°
44°
22
72°
47°
23
72°
47°
24
74°
51°
25
71°
52°
26
70°
49°
27
68°
47°
28
64°
46°
29
66°
48°
30
65°
52°
31
57°
43°
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 57° to 74°, with overnight lows between 38° and 52°. The average high for October is 68° with an average low of 46°. 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.
