S
M
T
W
T
F
S
26
89°
73°
27
89°
72°
28
90°
73°
29
89°
74°
30
89°
74°
31
90°
73°
1
89°
73°
2
90°
74°
3
90°
73°
4
91°
73°
5
90°
75°
6
91°
72°
7
91°
72°
8
88°
72°
9
88°
73°
10
89°
73°
11
89°
72°
12
88°
73°
13
88°
71°
14
89°
72°
15
91°
75°
16
91°
75°
17
90°
74°
18
91°
75°
19
91°
73°
20
90°
74°
21
90°
74°
22
89°
75°
23
90°
75°
24
90°
74°
25
89°
75°
26
90°
74°
27
90°
74°
28
89°
73°
29
90°
74°
30
89°
73°
31
90°
72°
1
89°
71°
2
88°
70°
3
87°
71°
4
88°
72°
5
88°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Johns Island
Johns Island's August 2026 forecast shows daily high temperatures ranging from 87° to 91°, with overnight lows between 70° and 75°. The average high for August is 89° with an average low of 73°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Johns Island. See also: September | October | November.
