S
M
T
W
T
F
S
29
63°
38°
30
80°
44°
31
67°
40°
1
40°
35°
2
69°
38°
3
59°
39°
4
52°
40°
5
52°
36°
6
51°
31°
7
41°
26°
8
70°
35°
9
69°
46°
10
54°
35°
11
57°
29°
12
79°
55°
13
78°
63°
14
82°
62°
15
72°
60°
16
73°
51°
17
81°
59°
18
63°
30°
19
47°
32°
20
59°
42°
21
66°
49°
22
67°
47°
23
65°
46°
24
63°
41°
25
65°
42°
26
64°
41°
27
59°
43°
28
57°
43°
29
64°
37°
30
57°
37°
1
59°
43°
2
58°
41°
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 47° to 82°, with overnight lows between 30° and 63°. The average high for April is 65° with an average low of 45°. 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.
