S
M
T
W
T
F
S
26
66°
54°
27
68°
48°
28
69°
53°
29
65°
57°
30
65°
48°
31
68°
49°
1
70°
64°
2
66°
61°
3
65°
51°
4
72°
52°
5
61°
56°
6
66°
56°
7
68°
55°
8
67°
54°
9
69°
53°
10
67°
54°
11
66°
54°
12
67°
52°
13
66°
53°
14
67°
54°
15
67°
53°
16
66°
55°
17
67°
53°
18
66°
51°
19
66°
53°
20
64°
52°
21
64°
54°
22
65°
51°
23
64°
54°
24
64°
50°
25
69°
55°
26
70°
56°
27
70°
57°
28
68°
57°
29
65°
55°
30
64°
50°
31
63°
50°
1
62°
51°
2
63°
50°
3
63°
51°
4
64°
51°
5
63°
52°
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 61° to 70°, with overnight lows between 50° and 57°. The average high for August is 66° with an average low of 53°. 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.
