S
M
T
W
T
F
S
29
68°
45°
30
73°
50°
31
77°
54°
1
79°
59°
2
77°
61°
3
79°
63°
4
79°
61°
5
81°
68°
6
70°
59°
7
68°
55°
8
66°
50°
9
72°
46°
10
75°
54°
11
78°
54°
12
79°
61°
13
78°
61°
14
82°
64°
15
81°
65°
16
84°
70°
17
86°
69°
18
85°
70°
19
84°
66°
20
75°
60°
21
78°
68°
22
77°
70°
23
81°
69°
24
79°
62°
25
78°
67°
26
78°
66°
27
76°
66°
28
77°
67°
29
74°
67°
30
76°
66°
1
75°
67°
2
76°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Sullivan's Island
Sullivan's Island's April 2026 forecast shows daily high temperatures ranging from 74° to 86°, with overnight lows between 54° and 70°. The average high for April is 79° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Sullivan's Island. See also: May | June | July.
