S
M
T
W
T
F
S
29
70°
28°
30
77°
43°
31
81°
48°
1
86°
54°
2
82°
55°
3
81°
57°
4
86°
54°
5
82°
64°
6
66°
45°
7
72°
43°
8
66°
46°
9
71°
40°
10
78°
45°
11
85°
49°
12
84°
55°
13
83°
57°
14
86°
56°
15
88°
62°
16
87°
62°
17
86°
60°
18
86°
60°
19
84°
60°
20
80°
60°
21
78°
59°
22
83°
62°
23
79°
56°
24
80°
58°
25
81°
58°
26
81°
57°
27
80°
56°
28
74°
53°
29
74°
55°
30
75°
54°
1
78°
58°
2
81°
59°
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 71° to 88°, with overnight lows between 40° and 62°. The average high for April is 81° with an average low of 56°. 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.
