S
M
T
W
T
F
S
26
88°
77°
27
88°
75°
28
93°
77°
29
93°
81°
30
95°
75°
31
90°
75°
1
91°
81°
2
88°
73°
3
88°
75°
4
88°
75°
5
84°
75°
6
86°
77°
7
90°
77°
8
84°
77°
9
88°
75°
10
91°
73°
11
93°
75°
12
97°
75°
13
99°
75°
14
93°
75°
15
95°
77°
16
93°
77°
17
100°
77°
18
N/A
19
97°
80°
20
96°
79°
21
93°
77°
22
90°
76°
23
89°
78°
24
90°
80°
25
87°
79°
26
88°
78°
27
88°
76°
28
87°
77°
29
83°
75°
30
85°
75°
31
86°
76°
1
85°
73°
2
82°
74°
3
84°
77°
4
87°
78°
5
88°
78°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Charleston
Charleston's August 2026 forecast shows daily high temperatures ranging from 82° to 97°, with overnight lows between 73° and 80°. The average high for August is 88° with an average low of 77°. 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.
