S
M
T
W
T
F
S
26
85°
66°
27
89°
71°
28
89°
71°
29
91°
70°
30
86°
70°
31
86°
70°
1
87°
70°
2
86°
70°
3
87°
71°
4
90°
71°
5
90°
70°
6
88°
70°
7
88°
69°
8
89°
70°
9
90°
71°
10
91°
71°
11
89°
70°
12
85°
70°
13
85°
69°
14
88°
70°
15
84°
68°
16
84°
69°
17
83°
69°
18
84°
70°
19
85°
70°
20
85°
69°
21
86°
69°
22
84°
68°
23
84°
69°
24
88°
68°
25
89°
68°
26
88°
67°
27
89°
66°
28
89°
68°
29
85°
67°
30
88°
65°
31
85°
66°
1
82°
65°
2
83°
66°
3
87°
67°
4
87°
67°
5
86°
66°
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 91°, with overnight lows between 65° and 71°. The average high for August is 87° with an average low of 69°. 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.
