S
M
T
W
T
F
S
26
85°
61°
27
84°
70°
28
82°
64°
29
68°
61°
30
66°
50°
1
66°
48°
2
70°
43°
3
73°
41°
4
81°
59°
5
70°
61°
6
68°
52°
7
68°
48°
8
82°
45°
9
82°
54°
10
84°
54°
11
75°
54°
12
81°
46°
13
82°
50°
14
77°
48°
15
84°
54°
16
82°
64°
17
88°
69°
18
85°
72°
19
82°
65°
20
73°
60°
21
73°
60°
22
77°
62°
23
79°
67°
24
80°
68°
25
81°
67°
26
84°
68°
27
83°
66°
28
84°
67°
29
82°
64°
30
85°
68°
31
86°
67°
1
87°
69°
2
87°
69°
3
84°
68°
4
80°
64°
5
82°
65°
6
87°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Charleston
Charleston's May 2026 forecast shows daily high temperatures ranging from 73° to 88°, with overnight lows between 60° and 72°. The average high for May is 82° with an average low of 66°. 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.
