S
M
T
W
T
F
S
26
54°
50°
27
57°
50°
28
52°
52°
29
52°
52°
30
57°
55°
1
57°
52°
2
57°
52°
3
57°
48°
4
59°
55°
5
59°
54°
6
57°
52°
7
59°
59°
8
60°
48°
9
63°
48°
10
63°
55°
11
63°
55°
12
61°
51°
13
61°
50°
14
62°
49°
15
59°
47°
16
59°
44°
17
61°
45°
18
62°
48°
19
61°
47°
20
65°
50°
21
67°
49°
22
64°
47°
23
62°
49°
24
61°
48°
25
70°
55°
26
56°
46°
27
56°
47°
28
57°
46°
29
58°
50°
30
58°
49°
31
59°
46°
1
59°
49°
2
61°
51°
3
60°
49°
4
61°
47°
5
63°
52°
6
64°
52°
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 56° to 70°, with overnight lows between 44° and 55°. The average high for May is 61° with an average low of 49°. 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.
