S
M
T
W
T
F
S
26
55°
39°
27
57°
36°
28
50°
37°
29
48°
45°
30
55°
46°
1
61°
43°
2
57°
43°
3
55°
42°
4
66°
47°
5
71°
55°
6
64°
54°
7
62°
43°
8
59°
41°
9
60°
47°
10
60°
45°
11
62°
47°
12
62°
47°
13
59°
50°
14
62°
45°
15
62°
48°
16
63°
47°
17
62°
44°
18
63°
50°
19
64°
50°
20
64°
48°
21
66°
51°
22
71°
47°
23
63°
47°
24
64°
51°
25
68°
48°
26
65°
50°
27
66°
48°
28
65°
51°
29
66°
53°
30
70°
52°
31
67°
50°
1
67°
48°
2
66°
47°
3
67°
49°
4
67°
48°
5
68°
49°
6
67°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Cohasset
Cohasset's May 2026 forecast shows daily high temperatures ranging from 55° to 71°, with overnight lows between 41° and 55°. The average high for May is 64° with an average low of 48°. 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 Cohasset. See also: June | July | August.
