S
M
T
W
T
F
S
26
55°
36°
27
65°
34°
28
66°
35°
29
62°
42°
30
52°
46°
1
59°
43°
2
53°
41°
3
57°
39°
4
61°
48°
5
64°
53°
6
63°
52°
7
60°
44°
8
59°
43°
9
57°
47°
10
60°
48°
11
63°
47°
12
61°
48°
13
62°
47°
14
61°
49°
15
64°
48°
16
68°
53°
17
69°
52°
18
69°
53°
19
68°
53°
20
66°
52°
21
66°
53°
22
67°
52°
23
64°
47°
24
62°
50°
25
64°
49°
26
64°
54°
27
65°
50°
28
64°
50°
29
65°
48°
30
65°
50°
31
66°
56°
1
70°
56°
2
68°
52°
3
67°
56°
4
71°
57°
5
69°
57°
6
68°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Charlestown
Charlestown's May 2026 forecast shows daily high temperatures ranging from 53° to 71°, with overnight lows between 39° and 57°. The average high for May is 64° with an average low of 50°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Charlestown. See also: June | July | August.
