S
M
T
W
T
F
S
1
77°
39°
2
54°
46°
3
66°
46°
4
79°
43°
5
81°
52°
6
84°
59°
7
82°
64°
8
82°
61°
9
82°
54°
10
86°
54°
11
90°
63°
12
72°
36°
13
64°
30°
14
77°
43°
15
77°
46°
16
72°
40°
17
50°
28°
18
52°
30°
19
66°
32°
20
75°
36°
21
86°
46°
22
90°
63°
23
88°
57°
24
61°
46°
25
70°
36°
26
81°
54°
27
88°
63°
28
70°
45°
29
70°
28°
30
77°
43°
31
81°
48°
1
86°
54°
2
82°
55°
3
81°
57°
4
86°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
March Weather in St. Charles
St. Charles's March 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for March is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how March weather will actually feel in St. Charles. See also: April | May | June.
