S
M
T
W
T
F
S
26
55°
39°
27
57°
36°
28
50°
37°
29
48°
45°
30
55°
46°
1
64°
43°
2
59°
41°
3
54°
36°
4
70°
41°
5
75°
50°
6
70°
57°
7
59°
48°
8
61°
41°
9
63°
36°
10
73°
54°
11
61°
43°
12
57°
44°
13
61°
53°
14
60°
50°
15
54°
47°
16
73°
57°
17
77°
51°
18
68°
57°
19
79°
58°
20
69°
50°
21
63°
50°
22
69°
54°
23
69°
54°
24
73°
52°
25
68°
49°
26
74°
54°
27
74°
54°
28
73°
53°
29
75°
56°
30
76°
56°
31
75°
55°
1
74°
54°
2
69°
52°
3
68°
52°
4
69°
55°
5
71°
56°
6
75°
56°
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 54° to 79°, with overnight lows between 44° and 58°. The average high for May is 70° with an average low of 53°. 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.
