S
M
T
W
T
F
S
26
84°
55°
27
84°
67°
28
77°
63°
29
69°
55°
30
68°
49°
1
66°
48°
2
68°
44°
3
73°
41°
4
82°
64°
5
68°
50°
6
62°
47°
7
67°
46°
8
75°
47°
9
82°
55°
10
77°
56°
11
77°
54°
12
82°
51°
13
82°
54°
14
75°
49°
15
85°
56°
16
85°
73°
17
89°
71°
18
89°
69°
19
87°
71°
20
69°
60°
21
75°
63°
22
77°
67°
23
82°
66°
24
79°
66°
25
78°
65°
26
77°
66°
27
81°
65°
28
80°
64°
29
83°
66°
30
84°
68°
31
83°
65°
1
84°
66°
2
83°
62°
3
83°
66°
4
79°
65°
5
83°
66°
6
84°
67°
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 69° to 84°, with overnight lows between 60° and 68°. The average high for May is 80° with an average low of 65°. 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.
