S
M
T
W
T
F
S
26
85°
68°
27
85°
62°
28
84°
63°
29
85°
68°
30
86°
64°
31
86°
68°
1
89°
66°
2
88°
64°
3
85°
63°
4
83°
61°
5
84°
62°
6
83°
63°
7
84°
62°
8
84°
62°
9
85°
68°
10
86°
65°
11
88°
68°
12
88°
68°
13
89°
69°
14
90°
68°
15
91°
62°
16
87°
62°
17
84°
63°
18
86°
65°
19
88°
61°
20
83°
60°
21
82°
60°
22
83°
61°
23
86°
65°
24
89°
66°
25
88°
65°
26
90°
61°
27
84°
60°
28
82°
59°
29
82°
65°
30
86°
65°
31
88°
66°
1
88°
65°
2
87°
64°
3
86°
65°
4
84°
64°
5
84°
63°
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 59° and 69°. The average high for August is 86° with an average low of 64°. 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.
