S
M
T
W
T
F
S
26
87°
78°
27
88°
77°
28
89°
80°
29
90°
79°
30
89°
80°
31
90°
80°
1
90°
79°
2
86°
80°
3
85°
80°
4
88°
79°
5
89°
80°
6
90°
79°
7
89°
80°
8
89°
78°
9
90°
80°
10
90°
80°
11
89°
79°
12
87°
79°
13
87°
78°
14
88°
79°
15
87°
77°
16
83°
77°
17
82°
79°
18
84°
78°
19
84°
78°
20
85°
78°
21
85°
78°
22
86°
78°
23
83°
78°
24
87°
76°
25
87°
77°
26
85°
75°
27
86°
76°
28
88°
75°
29
87°
77°
30
87°
77°
31
88°
76°
1
86°
77°
2
83°
77°
3
84°
76°
4
83°
77°
5
84°
77°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Charleston
Charleston's August 2026 forecast shows daily high temperatures ranging from 82° to 90°, with overnight lows between 75° and 80°. The average high for August is 87° with an average low of 78°. 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 Charleston. See also: September | October | November.
