S
M
T
W
T
F
S
26
58°
42°
27
57°
41°
28
58°
42°
29
59°
42°
30
53°
41°
31
54°
41°
1
58°
40°
2
55°
42°
3
55°
37°
4
55°
41°
5
57°
36°
6
57°
40°
7
58°
41°
8
61°
37°
9
56°
37°
10
61°
41°
11
61°
41°
12
60°
39°
13
60°
37°
14
57°
39°
15
57°
42°
16
61°
41°
17
59°
40°
18
62°
37°
19
57°
35°
20
57°
41°
21
61°
37°
22
62°
43°
23
63°
43°
24
64°
44°
25
64°
42°
26
65°
40°
27
61°
37°
28
58°
43°
29
62°
43°
30
64°
42°
31
59°
43°
1
64°
42°
2
59°
44°
3
64°
42°
4
66°
41°
5
60°
42°
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 53° to 66°, with overnight lows between 35° and 44°. The average high for August is 60° with an average low of 41°. 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.
