S
M
T
W
T
F
S
29
71°
41°
30
80°
55°
31
82°
64°
1
80°
61°
2
77°
66°
3
81°
65°
4
67°
42°
5
62°
36°
6
70°
35°
7
66°
44°
8
75°
41°
9
79°
53°
10
80°
55°
11
81°
59°
12
75°
64°
13
79°
66°
14
80°
61°
15
81°
58°
16
77°
54°
17
76°
57°
18
74°
54°
19
77°
56°
20
76°
55°
21
75°
56°
22
69°
45°
23
73°
53°
24
74°
52°
25
75°
51°
26
69°
49°
27
70°
51°
28
74°
52°
29
76°
55°
30
74°
54°
1
72°
53°
2
67°
50°
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 67° to 81°, with overnight lows between 45° and 66°. The average high for April is 75° with an average low of 55°. 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.
