S
M
T
W
T
F
S
26
86°
71°
27
87°
71°
28
86°
71°
29
89°
70°
30
79°
69°
1
70°
57°
2
72°
54°
3
76°
49°
4
79°
52°
5
82°
59°
6
86°
72°
7
78°
70°
8
83°
67°
9
74°
62°
10
81°
65°
11
77°
66°
12
82°
66°
13
85°
64°
14
88°
64°
15
88°
66°
16
85°
68°
17
85°
71°
18
88°
72°
19
89°
75°
20
86°
70°
21
82°
70°
22
88°
73°
23
74°
69°
24
74°
69°
25
82°
71°
26
87°
68°
27
87°
72°
28
87°
73°
29
89°
71°
30
92°
71°
31
92°
73°
1
86°
75°
2
88°
70°
3
84°
71°
4
82°
71°
5
86°
71°
6
85°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Saint Charles
Saint Charles's May 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for May 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 May weather will actually feel in Saint Charles. See also: June | July | August.
