S
M
T
W
T
F
S
26
82°
67°
27
83°
68°
28
87°
68°
29
86°
67°
30
87°
69°
31
87°
69°
1
83°
68°
2
86°
69°
3
88°
70°
4
89°
69°
5
86°
69°
6
88°
68°
7
88°
69°
8
87°
64°
9
81°
62°
10
82°
63°
11
83°
68°
12
82°
68°
13
87°
69°
14
87°
68°
15
86°
68°
16
83°
67°
17
83°
61°
18
85°
60°
19
88°
61°
20
89°
63°
21
88°
65°
22
87°
66°
23
88°
66°
24
85°
65°
25
81°
65°
26
81°
63°
27
82°
63°
28
80°
65°
29
81°
64°
30
81°
62°
31
82°
65°
1
87°
62°
2
86°
64°
3
86°
61°
4
80°
57°
5
80°
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 80° to 89°, with overnight lows between 57° and 70°. The average high for August is 85° with an average low of 65°. 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.
