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
77°
63°
14
86°
63°
15
75°
55°
16
81°
57°
17
86°
68°
18
82°
68°
19
82°
64°
20
84°
64°
21
84°
68°
22
86°
72°
23
84°
73°
24
86°
73°
25
86°
75°
26
86°
77°
27
82°
75°
28
85°
72°
29
83°
71°
30
78°
71°
31
79°
70°
1
77°
68°
2
79°
68°
3
77°
69°
4
78°
70°
5
79°
71°
6
83°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Johns Island
Johns Island's May 2026 forecast shows daily high temperatures ranging from 77° to 85°, with overnight lows between 68° and 75°. The average high for May is 80° 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 Johns Island. See also: June | July | August.
