S
M
T
W
T
F
S
29
70°
52°
30
79°
59°
31
82°
62°
1
84°
66°
2
85°
62°
3
84°
66°
4
84°
66°
5
69°
48°
6
67°
47°
7
77°
47°
8
77°
51°
9
77°
52°
10
81°
51°
11
86°
57°
12
87°
59°
13
85°
62°
14
87°
60°
15
86°
66°
16
85°
65°
17
84°
64°
18
89°
64°
19
84°
63°
20
81°
64°
21
82°
63°
22
87°
64°
23
80°
59°
24
81°
61°
25
79°
60°
26
78°
59°
27
78°
59°
28
80°
60°
29
81°
61°
30
81°
62°
1
80°
62°
2
80°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Alton
Alton's April 2026 forecast shows daily high temperatures ranging from 77° to 89°, with overnight lows between 51° and 66°. The average high for April 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 April weather will actually feel in Alton. See also: May | June | July.
