S
M
T
W
T
F
S
26
50°
36°
27
47°
33°
28
53°
32°
29
57°
27°
30
59°
31°
1
68°
31°
2
71°
31°
3
74°
40°
4
70°
41°
5
53°
40°
6
59°
36°
7
71°
35°
8
73°
36°
9
74°
41°
10
78°
36°
11
85°
46°
12
89°
55°
13
81°
50°
14
73°
46°
15
76°
36°
16
67°
41°
17
56°
38°
18
52°
37°
19
59°
32°
20
65°
30°
21
66°
43°
22
68°
31°
23
78°
33°
24
82°
41°
25
80°
46°
26
71°
53°
27
77°
50°
28
80°
48°
29
75°
43°
30
61°
42°
31
72°
40°
1
78°
41°
2
85°
43°
3
85°
42°
4
85°
56°
5
89°
51°
6
89°
63°
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 ° to °, with overnight lows between ° and °. The average high for May is ° with an average low of °. 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.
