S
M
T
W
T
F
S
26
52°
25°
27
49°
33°
28
48°
30°
29
57°
24°
30
58°
29°
1
57°
22°
2
75°
27°
3
72°
40°
4
57°
36°
5
49°
26°
6
52°
31°
7
66°
38°
8
72°
42°
9
67°
35°
10
62°
37°
11
65°
41°
12
73°
50°
13
76°
45°
14
67°
42°
15
70°
46°
16
69°
47°
17
66°
43°
18
69°
46°
19
68°
51°
20
67°
46°
21
63°
43°
22
64°
42°
23
65°
45°
24
66°
44°
25
64°
43°
26
65°
44°
27
66°
44°
28
66°
46°
29
69°
53°
30
67°
47°
31
69°
50°
1
76°
56°
2
78°
57°
3
79°
58°
4
80°
59°
5
78°
59°
6
79°
58°
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 49° to 80°, with overnight lows between 26° and 59°. The average high for May is 68° with an average low of 46°. 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.
