S
M
T
W
T
F
S
29
68°
36°
30
73°
59°
31
81°
64°
1
73°
59°
2
78°
57°
3
82°
67°
4
73°
44°
5
54°
37°
6
63°
37°
7
54°
40°
8
71°
52°
9
77°
51°
10
76°
54°
11
72°
55°
12
83°
62°
13
76°
66°
14
80°
64°
15
68°
56°
16
71°
55°
17
73°
59°
18
74°
58°
19
75°
59°
20
76°
63°
21
77°
48°
22
68°
48°
23
67°
55°
24
73°
56°
25
74°
54°
26
68°
50°
27
67°
49°
28
67°
52°
29
75°
56°
30
73°
57°
1
73°
56°
2
67°
56°
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 83°, with overnight lows between 48° and 66°. The average high for April is 73° with an average low of 56°. 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.
