S
M
T
W
T
F
S
26
68°
44°
27
61°
45°
28
53°
37°
29
61°
36°
30
57°
40°
1
58°
33°
2
68°
30°
3
74°
49°
4
79°
42°
5
58°
41°
6
61°
32°
7
71°
45°
8
80°
49°
9
76°
39°
10
74°
35°
11
85°
44°
12
80°
53°
13
79°
41°
14
83°
57°
15
93°
53°
16
85°
53°
17
84°
60°
18
58°
50°
19
61°
44°
20
57°
39°
21
66°
47°
22
74°
53°
23
75°
46°
24
82°
59°
25
87°
59°
26
87°
59°
27
83°
61°
28
78°
63°
29
74°
58°
30
77°
59°
31
81°
56°
1
80°
54°
2
78°
57°
3
79°
58°
4
82°
57°
5
81°
59°
6
80°
58°
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 74° to 87°, with overnight lows between 54° and 63°. The average high for May is 81° with an average low of 58°. 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.
