S
M
T
W
T
F
S
26
81°
51°
27
76°
53°
28
78°
70°
29
72°
68°
30
74°
64°
31
80°
62°
1
81°
64°
2
79°
72°
3
77°
66°
4
82°
59°
5
82°
58°
6
86°
73°
7
89°
73°
8
86°
72°
9
87°
70°
10
84°
62°
11
84°
68°
12
84°
67°
13
80°
66°
14
82°
64°
15
78°
59°
16
78°
57°
17
70°
66°
18
77°
66°
19
84°
68°
20
84°
64°
21
68°
63°
22
70°
65°
23
78°
66°
24
80°
60°
25
78°
58°
26
78°
60°
27
79°
66°
28
79°
63°
29
81°
59°
30
78°
63°
31
77°
60°
1
75°
62°
2
77°
61°
3
74°
59°
4
75°
58°
5
76°
59°
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 74° to 81°, with overnight lows between 58° and 66°. The average high for August is 77° with an average low of 61°. 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.
