S
M
T
W
T
F
S
26
79°
59°
27
64°
54°
28
75°
52°
29
81°
59°
30
75°
59°
1
70°
59°
2
63°
54°
3
68°
48°
4
75°
50°
5
77°
54°
6
82°
61°
7
81°
70°
8
72°
57°
9
81°
63°
10
82°
66°
11
86°
66°
12
72°
59°
13
79°
61°
14
84°
63°
15
77°
54°
16
81°
55°
17
86°
68°
18
84°
66°
19
82°
64°
20
84°
63°
21
86°
68°
22
86°
70°
23
86°
72°
24
86°
72°
25
86°
75°
26
86°
77°
27
88°
77°
28
93°
72°
29
85°
75°
30
78°
69°
31
78°
70°
1
80°
68°
2
80°
68°
3
80°
69°
4
79°
70°
5
77°
71°
6
79°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sullivan's Island
Sullivan's Island's May 2026 forecast shows daily high temperatures ranging from 77° to 93°, with overnight lows between 68° and 75°. The average high for May is 81° with an average low of 71°. 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 Sullivan's Island. See also: June | July | August.
