S
M
T
W
T
F
S
26
54°
46°
27
66°
44°
28
69°
48°
29
75°
51°
30
81°
55°
1
79°
59°
2
74°
62°
3
61°
53°
4
55°
50°
5
59°
48°
6
70°
55°
7
77°
57°
8
80°
58°
9
85°
60°
10
85°
64°
11
89°
63°
12
86°
68°
13
78°
55°
14
81°
58°
15
83°
58°
16
76°
59°
17
71°
54°
18
77°
56°
19
-100°
-100°
20
82°
63°
21
85°
66°
22
85°
64°
23
81°
63°
24
80°
52°
25
77°
52°
26
75°
52°
27
81°
54°
28
81°
56°
29
82°
55°
30
79°
54°
31
82°
55°
1
84°
57°
2
80°
52°
3
80°
53°
4
75°
52°
5
75°
53°
6
76°
53°
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 75° to 85°, with overnight lows between 52° and 66°. The average high for May is 80° with an average low of 56°. 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.
