S
M
T
W
T
F
S
26
53°
38°
27
66°
37°
28
60°
38°
29
55°
43°
30
52°
46°
1
61°
46°
2
53°
42°
3
58°
42°
4
62°
49°
5
67°
54°
6
62°
51°
7
60°
43°
8
56°
43°
9
58°
49°
10
59°
46°
11
62°
47°
12
62°
47°
13
61°
49°
14
62°
48°
15
60°
51°
16
60°
49°
17
61°
48°
18
61°
53°
19
63°
53°
20
63°
52°
21
64°
54°
22
68°
50°
23
60°
51°
24
63°
54°
25
64°
51°
26
63°
53°
27
64°
52°
28
63°
56°
29
66°
56°
30
68°
55°
31
65°
54°
1
65°
50°
2
64°
50°
3
64°
51°
4
65°
51°
5
64°
52°
6
65°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Groton
Groton's May 2026 forecast shows daily high temperatures ranging from 53° to 68°, with overnight lows between 42° and 56°. The average high for May is 62° 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 Groton. See also: June | July | August.
