S
M
T
W
T
F
S
29
73°
43°
30
85°
63°
31
80°
65°
1
70°
48°
2
78°
57°
3
83°
61°
4
76°
43°
5
59°
39°
6
63°
43°
7
56°
42°
8
77°
44°
9
82°
60°
10
70°
54°
11
70°
50°
12
80°
64°
13
85°
68°
14
89°
69°
15
77°
65°
16
85°
59°
17
86°
52°
18
64°
39°
19
62°
44°
20
68°
50°
21
72°
54°
22
74°
57°
23
76°
55°
24
74°
50°
25
68°
47°
26
63°
44°
27
65°
45°
28
71°
49°
29
64°
49°
30
65°
46°
1
67°
45°
2
66°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in St. Charles
St. Charles's April 2026 forecast shows daily high temperatures ranging from 62° to 86°, with overnight lows between 39° and 65°. The average high for April is 70° with an average low of 50°. 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 St. Charles. See also: May | June | July.
