S
M
T
W
T
F
S
29
73°
42°
30
85°
52°
31
74°
49°
1
49°
40°
2
71°
43°
3
66°
40°
4
45°
37°
5
60°
32°
6
48°
40°
7
43°
32°
8
71°
40°
9
54°
45°
10
55°
40°
11
64°
40°
12
69°
65°
13
81°
64°
14
85°
65°
15
78°
59°
16
82°
51°
17
82°
45°
18
54°
33°
19
60°
35°
20
72°
32°
21
N/A
22
79°
60°
23
73°
50°
24
66°
42°
25
66°
48°
26
67°
54°
27
62°
42°
28
61°
42°
29
62°
43°
30
61°
42°
1
63°
42°
2
64°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
April Weather in St. Charles
St. Charles's April 2026 forecast shows daily high temperatures ranging from 61° to 79°, with overnight lows between 42° and 60°. The average high for April is 66° with an average low of 46°. 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.
