S
M
T
W
T
F
S
26
86°
78°
27
89°
77°
28
88°
76°
29
88°
76°
30
87°
77°
31
89°
78°
1
91°
77°
2
90°
76°
3
88°
78°
4
88°
75°
5
89°
75°
6
87°
76°
7
86°
75°
8
86°
75°
9
87°
76°
10
87°
77°
11
88°
76°
12
86°
76°
13
89°
77°
14
90°
78°
15
90°
76°
16
89°
77°
17
89°
78°
18
87°
76°
19
86°
75°
20
85°
74°
21
86°
75°
22
86°
75°
23
87°
76°
24
89°
76°
25
88°
77°
26
89°
77°
27
85°
76°
28
85°
76°
29
84°
75°
30
85°
73°
31
88°
72°
1
84°
73°
2
84°
75°
3
85°
73°
4
84°
74°
5
87°
75°
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 84° to 91°, with overnight lows between 72° and 78°. The average high for August is 87° with an average low of 76°. 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.
