S
M
T
W
T
F
S
26
81°
61°
27
63°
54°
28
73°
54°
29
79°
61°
30
75°
61°
1
70°
59°
2
64°
54°
3
68°
46°
4
75°
50°
5
77°
55°
6
81°
64°
7
82°
70°
8
72°
61°
9
81°
64°
10
82°
66°
11
90°
66°
12
72°
61°
13
73°
63°
14
83°
57°
15
75°
62°
16
84°
67°
17
84°
69°
18
83°
72°
19
84°
73°
20
83°
74°
21
82°
71°
22
81°
73°
23
81°
74°
24
80°
72°
25
80°
70°
26
82°
71°
27
84°
75°
28
83°
74°
29
85°
75°
30
85°
75°
31
84°
74°
1
84°
74°
2
83°
75°
3
84°
75°
4
80°
74°
5
80°
75°
6
84°
75°
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 73° to 85°, with overnight lows between 57° and 75°. The average high for May is 82° with an average low of 72°. 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.
