S
M
T
W
T
F
S
26
66°
28°
27
68°
30°
28
68°
32°
29
51°
36°
30
55°
41°
1
51°
34°
2
52°
28°
3
41°
33°
4
56°
38°
5
72°
51°
6
55°
48°
7
56°
37°
8
53°
36°
9
59°
40°
10
59°
41°
11
60°
37°
12
58°
38°
13
58°
37°
14
62°
43°
15
61°
41°
16
62°
41°
17
61°
40°
18
62°
45°
19
70°
45°
20
69°
46°
21
65°
46°
22
69°
47°
23
66°
46°
24
68°
45°
25
63°
45°
26
63°
43°
27
64°
47°
28
64°
44°
29
65°
43°
30
64°
43°
31
68°
48°
1
66°
44°
2
66°
42°
3
68°
49°
4
71°
49°
5
66°
45°
6
70°
51°
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 53° to 72°, with overnight lows between 36° and 51°. The average high for May is 64° with an average low of 44°. 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.
