S
M
T
W
T
F
S
29
55°
27°
30
70°
41°
31
72°
53°
1
62°
35°
2
51°
34°
3
61°
44°
4
70°
38°
5
64°
34°
6
43°
33°
7
36°
20°
8
53°
18°
9
N/A
10
54°
36°
11
46°
34°
12
58°
55°
13
65°
49°
14
67°
50°
15
69°
53°
16
64°
48°
17
65°
40°
18
53°
38°
19
59°
44°
20
60°
43°
21
62°
43°
22
57°
36°
23
51°
34°
24
52°
43°
25
53°
43°
26
57°
41°
27
53°
39°
28
54°
36°
29
55°
39°
30
60°
44°
1
59°
45°
2
64°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
April Weather in Alton
Alton's April 2026 forecast shows daily high temperatures ranging from 46° to 69°, with overnight lows between 34° and 55°. The average high for April is 58° with an average low of 42°. 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.
