S
M
T
W
T
F
S
26
76°
53°
27
77°
53°
28
77°
57°
29
78°
61°
30
82°
61°
31
84°
62°
1
84°
62°
2
85°
61°
3
85°
62°
4
84°
56°
5
81°
54°
6
76°
54°
7
76°
53°
8
77°
54°
9
78°
55°
10
80°
56°
11
79°
60°
12
81°
59°
13
82°
60°
14
83°
61°
15
79°
61°
16
84°
53°
17
78°
55°
18
77°
52°
19
77°
54°
20
81°
58°
21
81°
59°
22
74°
58°
23
78°
56°
24
75°
56°
25
80°
58°
26
80°
54°
27
77°
50°
28
74°
56°
29
73°
57°
30
74°
58°
31
80°
59°
1
81°
58°
2
78°
56°
3
79°
52°
4
73°
51°
5
79°
56°
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 73° to 85°, with overnight lows between 50° and 62°. The average high for August is 79° with an average low of 57°. 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.
