S
M
T
W
T
F
S
29
68°
28°
30
72°
46°
31
81°
50°
1
79°
52°
2
84°
52°
3
82°
55°
4
81°
50°
5
63°
45°
6
66°
34°
7
64°
37°
8
70°
34°
9
73°
44°
10
76°
52°
11
73°
52°
12
82°
55°
13
74°
55°
14
79°
58°
15
83°
58°
16
75°
52°
17
74°
49°
18
76°
52°
19
72°
54°
20
74°
51°
21
73°
50°
22
74°
42°
23
71°
48°
24
76°
49°
25
72°
48°
26
72°
47°
27
68°
41°
28
67°
43°
29
74°
48°
30
76°
50°
1
75°
51°
2
71°
51°
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 67° to 83°, with overnight lows between 41° and 58°. The average high for April is 74° 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.
