S
M
T
W
T
F
S
29
58°
35°
30
73°
42°
31
51°
42°
1
38°
28°
2
61°
31°
3
62°
38°
4
54°
36°
5
41°
34°
6
46°
25°
7
36°
22°
8
55°
25°
9
67°
42°
10
48°
37°
11
54°
30°
12
76°
41°
13
75°
48°
14
74°
48°
15
69°
57°
16
64°
52°
17
74°
56°
18
63°
33°
19
47°
25°
20
48°
37°
21
65°
41°
22
66°
40°
23
58°
36°
24
59°
37°
25
59°
39°
26
54°
35°
27
55°
38°
28
57°
40°
29
59°
39°
30
64°
40°
1
64°
42°
2
56°
40°
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 74°, with overnight lows between 25° and 56°. The average high for April is 60° with an average low of 39°. 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.
