S
M
T
W
T
F
S
26
79°
55°
27
79°
52°
28
70°
57°
29
81°
63°
30
68°
52°
1
70°
50°
2
66°
46°
3
68°
39°
4
77°
43°
5
79°
48°
6
72°
63°
7
66°
50°
8
72°
43°
9
77°
52°
10
82°
52°
11
73°
54°
12
77°
50°
13
N/A
14
72°
43°
15
77°
51°
16
84°
61°
17
89°
63°
18
89°
65°
19
89°
66°
20
83°
62°
21
82°
60°
22
81°
61°
23
83°
60°
24
81°
62°
25
83°
62°
26
84°
64°
27
85°
59°
28
81°
62°
29
83°
63°
30
79°
62°
31
79°
59°
1
80°
60°
2
83°
61°
3
84°
62°
4
86°
65°
5
86°
65°
6
85°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Charleston
Charleston's May 2026 forecast shows daily high temperatures ranging from 72° to 89°, with overnight lows between 43° and 66°. The average high for May is 83° with an average low of 61°. 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 Charleston. See also: June | July | August.
