S
M
T
W
T
F
S
26
90°
51°
27
93°
55°
28
93°
51°
29
95°
51°
30
94°
54°
31
87°
47°
1
85°
47°
2
86°
46°
3
85°
48°
4
86°
47°
5
87°
48°
6
87°
48°
7
86°
49°
8
87°
47°
9
86°
50°
10
87°
51°
11
86°
48°
12
87°
47°
13
85°
47°
14
85°
46°
15
84°
45°
16
83°
45°
17
84°
47°
18
85°
49°
19
86°
47°
20
87°
51°
21
90°
51°
22
88°
50°
23
85°
51°
24
85°
50°
25
83°
51°
26
85°
50°
27
83°
48°
28
81°
42°
29
81°
41°
30
80°
40°
31
81°
41°
1
82°
41°
2
85°
42°
3
86°
41°
4
84°
46°
5
86°
46°
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 95°, with overnight lows between 40° and 55°. The average high for August is 86° with an average low of 47°. 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.
