S
M
T
W
T
F
S
26
83°
69°
27
84°
68°
28
84°
71°
29
80°
64°
30
83°
58°
31
85°
60°
1
84°
65°
2
84°
71°
3
83°
67°
4
88°
64°
5
90°
69°
6
88°
68°
7
89°
70°
8
85°
68°
9
91°
70°
10
88°
69°
11
80°
66°
12
78°
66°
13
87°
64°
14
89°
73°
15
89°
72°
16
91°
71°
17
87°
71°
18
86°
69°
19
84°
67°
20
81°
67°
21
85°
65°
22
86°
65°
23
81°
62°
24
78°
57°
25
81°
53°
26
84°
56°
27
87°
63°
28
85°
64°
29
87°
60°
30
90°
66°
31
93°
69°
1
97°
70°
2
97°
69°
3
97°
73°
4
93°
68°
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 86° to 97°, with overnight lows between 66° and 73°. The average high for August is 94° 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.
