S
M
T
W
T
F
S
26
69°
50°
27
82°
44°
28
76°
55°
29
66°
53°
30
58°
41°
1
69°
40°
2
59°
42°
3
63°
47°
4
74°
56°
5
81°
59°
6
69°
51°
7
58°
43°
8
59°
47°
9
65°
48°
10
70°
53°
11
72°
53°
12
74°
54°
13
73°
53°
14
69°
52°
15
73°
58°
16
75°
58°
17
73°
57°
18
78°
59°
19
78°
59°
20
77°
58°
21
79°
60°
22
80°
60°
23
79°
59°
24
76°
59°
25
77°
60°
26
80°
61°
27
80°
59°
28
75°
60°
29
78°
60°
30
75°
59°
31
76°
60°
1
77°
61°
2
79°
62°
3
80°
59°
4
75°
56°
5
74°
56°
6
75°
55°
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 58° to 81°, with overnight lows between 40° and 62°. The average high for May is 74° with an average low of 55°. 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.
