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
60°
35°
11
61°
52°
12
72°
59°
13
78°
63°
14
78°
59°
15
74°
53°
16
74°
47°
17
64°
42°
18
54°
40°
19
59°
44°
20
64°
50°
21
70°
55°
22
70°
50°
23
62°
40°
24
60°
46°
25
67°
44°
26
57°
39°
27
57°
38°
28
58°
47°
29
67°
49°
30
67°
49°
1
69°
45°
2
59°
43°
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 54° to 78°, with overnight lows between 35° and 63°. The average high for April is 65° with an average low of 47°. 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.
