S
M
T
W
T
F
S
26
97°
76°
27
98°
76°
28
98°
75°
29
95°
75°
30
94°
74°
31
94°
75°
1
94°
70°
2
82°
67°
3
90°
66°
4
92°
67°
5
94°
67°
6
95°
70°
7
95°
73°
8
94°
71°
9
95°
72°
10
94°
73°
11
93°
72°
12
95°
73°
13
92°
72°
14
92°
71°
15
95°
72°
16
96°
73°
17
94°
72°
18
91°
69°
19
94°
74°
20
93°
73°
21
94°
73°
22
93°
72°
23
93°
73°
24
92°
73°
25
93°
72°
26
93°
72°
27
92°
71°
28
92°
71°
29
91°
70°
30
92°
71°
31
91°
71°
1
90°
70°
2
92°
71°
3
92°
70°
4
91°
70°
5
91°
69°
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 90° to 96°, with overnight lows between 67° and 74°. The average high for August is 93° with an average low of 71°. 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.
