S
M
T
W
T
F
S
29
73°
43°
30
85°
63°
31
80°
65°
1
70°
48°
2
78°
57°
3
83°
61°
4
76°
43°
5
59°
39°
6
63°
43°
7
56°
42°
8
77°
44°
9
82°
60°
10
70°
54°
11
70°
50°
12
81°
67°
13
86°
69°
14
89°
69°
15
77°
62°
16
82°
60°
17
87°
63°
18
69°
41°
19
60°
40°
20
67°
48°
21
69°
50°
22
75°
54°
23
74°
53°
24
71°
54°
25
70°
47°
26
64°
42°
27
64°
48°
28
65°
44°
29
68°
49°
30
65°
45°
1
68°
52°
2
66°
55°
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 60° to 89°, with overnight lows between 40° and 69°. The average high for April is 72° with an average low of 53°. 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.
