S
M
T
W
T
F
S
26
78°
52°
27
78°
60°
28
65°
55°
29
63°
44°
30
66°
40°
1
62°
43°
2
61°
43°
3
76°
43°
4
75°
58°
5
71°
46°
6
61°
44°
7
67°
38°
8
72°
49°
9
78°
50°
10
70°
50°
11
76°
43°
12
81°
51°
13
73°
52°
14
73°
46°
15
83°
65°
16
79°
65°
17
89°
70°
18
83°
71°
19
78°
54°
20
70°
50°
21
72°
51°
22
80°
54°
23
83°
60°
24
76°
60°
25
77°
60°
26
78°
64°
27
81°
63°
28
79°
59°
29
82°
61°
30
75°
58°
31
75°
57°
1
74°
56°
2
75°
56°
3
75°
59°
4
80°
64°
5
84°
66°
6
85°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Glen Carbon
Glen Carbon's May 2026 forecast shows daily high temperatures ranging from 70° to 89°, with overnight lows between 50° and 71°. The average high for May is 79° with an average low of 60°. 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 Glen Carbon. See also: June | July | August.
