S
M
T
W
T
F
S
26
60°
36°
27
47°
36°
28
45°
38°
29
44°
38°
30
43°
39°
1
57°
40°
2
56°
38°
3
43°
35°
4
62°
35°
5
51°
41°
6
53°
44°
7
53°
41°
8
62°
37°
9
52°
34°
10
50°
42°
11
49°
43°
12
53°
39°
13
61°
38°
14
57°
40°
15
58°
44°
16
76°
44°
17
81°
44°
18
67°
46°
19
56°
46°
20
N/A
21
66°
42°
22
66°
41°
23
62°
37°
24
60°
42°
25
56°
48°
26
63°
49°
27
60°
45°
28
61°
46°
29
60°
46°
30
63°
48°
31
58°
48°
1
60°
47°
2
63°
45°
3
66°
49°
4
71°
50°
5
72°
50°
6
68°
49°
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 56° to 72°, with overnight lows between 37° and 50°. The average high for May is 63° with an average low of 46°. 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.
