S
M
T
W
T
F
S
26
84°
66°
27
82°
64°
28
83°
69°
29
85°
65°
30
81°
66°
31
81°
66°
1
82°
67°
2
81°
69°
3
84°
69°
4
85°
68°
5
86°
65°
6
80°
62°
7
81°
67°
8
87°
67°
9
82°
68°
10
86°
68°
11
83°
65°
12
84°
67°
13
86°
68°
14
85°
66°
15
80°
62°
16
79°
61°
17
79°
65°
18
80°
67°
19
80°
68°
20
83°
68°
21
84°
67°
22
85°
66°
23
84°
67°
24
87°
66°
25
87°
66°
26
86°
64°
27
80°
63°
28
81°
64°
29
78°
58°
30
78°
57°
31
76°
58°
1
76°
63°
2
77°
65°
3
82°
64°
4
84°
65°
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 76° to 87°, with overnight lows between 57° and 69°. The average high for August is 82° 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.
