S
M
T
W
T
F
S
26
73°
55°
27
70°
52°
28
70°
46°
29
82°
55°
30
73°
57°
1
66°
55°
2
59°
50°
3
72°
41°
4
81°
45°
5
82°
48°
6
84°
59°
7
79°
59°
8
72°
50°
9
77°
57°
10
86°
59°
11
86°
57°
12
70°
48°
13
81°
46°
14
81°
57°
15
79°
43°
16
88°
48°
17
91°
59°
18
91°
63°
19
93°
61°
20
93°
61°
21
95°
64°
22
93°
68°
23
86°
68°
24
82°
68°
25
84°
72°
26
88°
72°
27
86°
70°
28
90°
72°
29
88°
68°
30
88°
72°
31
72°
64°
1
86°
66°
2
77°
57°
3
81°
48°
4
86°
52°
5
88°
57°
6
88°
61°
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.
