S
M
T
W
T
F
S
26
83°
69°
27
84°
69°
28
85°
68°
29
85°
69°
30
87°
64°
31
83°
62°
1
81°
64°
2
82°
68°
3
85°
68°
4
84°
64°
5
86°
68°
6
87°
69°
7
86°
68°
8
83°
64°
9
84°
66°
10
85°
63°
11
85°
68°
12
89°
68°
13
91°
67°
14
90°
68°
15
89°
67°
16
90°
68°
17
89°
63°
18
89°
59°
19
83°
58°
20
81°
58°
21
82°
59°
22
82°
59°
23
83°
60°
24
83°
59°
25
86°
59°
26
86°
60°
27
88°
59°
28
83°
58°
29
81°
57°
30
82°
57°
31
83°
59°
1
86°
58°
2
81°
57°
3
80°
63°
4
87°
62°
5
86°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Charlestown
Charlestown's August 2026 forecast shows daily high temperatures ranging from 80° to 91°, with overnight lows between 57° and 69°. The average high for August is 85° with an average low of 63°. 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 Charlestown. See also: September | October | November.
