S
M
T
W
T
F
S
29
70°
22°
30
66°
22°
31
59°
35°
1
51°
35°
2
57°
28°
3
49°
11°
4
57°
11°
5
61°
18°
6
62°
17°
7
66°
25°
8
68°
20°
9
67°
37°
10
61°
39°
11
55°
35°
12
52°
33°
13
43°
20°
14
54°
25°
15
60°
27°
16
66°
31°
17
64°
35°
18
63°
35°
19
60°
31°
20
62°
33°
21
63°
31°
22
62°
32°
23
54°
26°
24
55°
28°
25
56°
31°
26
56°
32°
27
57°
32°
28
55°
26°
29
55°
25°
30
56°
31°
1
57°
27°
2
58°
31°
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 43° to 67°, with overnight lows between 20° and 39°. The average high for April is 58° with an average low of 31°. 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.
