S
M
T
W
T
F
S
26
80°
66°
27
66°
57°
28
76°
58°
29
81°
64°
30
79°
67°
1
71°
64°
2
65°
54°
3
71°
51°
4
78°
54°
5
77°
56°
6
83°
64°
7
82°
69°
8
74°
64°
9
82°
66°
10
85°
67°
11
90°
71°
12
73°
63°
13
74°
63°
14
85°
65°
15
80°
57°
16
82°
63°
17
85°
72°
18
84°
69°
19
86°
70°
20
86°
70°
21
89°
71°
22
88°
74°
23
N/A
24
82°
73°
25
82°
74°
26
82°
75°
27
82°
72°
28
87°
71°
29
85°
72°
30
81°
67°
31
76°
64°
1
82°
67°
2
81°
68°
3
82°
67°
4
84°
70°
5
86°
71°
6
82°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in St. Helena Island
St. Helena Island's May 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 64° and 75°. The average high for May is 82° with an average low of 70°. 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 St. Helena Island. See also: June | July | August.
