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
48°
30°
6
51°
31°
7
64°
27°
8
71°
31°
9
61°
32°
10
64°
40°
11
77°
49°
12
76°
42°
13
73°
51°
14
82°
52°
15
79°
53°
16
81°
52°
17
77°
49°
18
72°
48°
19
78°
55°
20
80°
54°
21
78°
54°
22
71°
49°
23
72°
53°
24
75°
54°
25
77°
56°
26
76°
56°
27
77°
55°
28
76°
54°
29
66°
50°
30
67°
49°
31
70°
54°
1
72°
56°
2
68°
56°
3
68°
55°
4
74°
56°
5
78°
57°
6
77°
57°
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 61° to 82°, with overnight lows between 32° and 57°. The average high for May is 74° with an average low of 52°. 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.
