S
M
T
W
T
F
S
29
92°
69°
30
92°
67°
31
93°
69°
1
93°
74°
2
95°
76°
3
95°
76°
4
93°
77°
5
78°
56°
6
79°
57°
7
80°
57°
8
78°
67°
9
85°
72°
10
85°
68°
11
85°
73°
12
86°
75°
13
90°
72°
14
91°
74°
15
90°
75°
16
91°
75°
17
89°
75°
18
89°
63°
19
63°
55°
20
76°
69°
21
86°
71°
22
88°
71°
23
88°
74°
24
90°
76°
25
92°
74°
26
93°
76°
27
95°
72°
28
94°
73°
29
93°
71°
30
88°
73°
1
90°
71°
2
84°
71°
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 76° to 95°, with overnight lows between 69° and 76°. The average high for April is 89° with an average low of 72°. 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.
