S
M
T
W
T
F
S
26
80°
63°
27
83°
66°
28
80°
66°
29
79°
65°
30
84°
63°
31
78°
59°
1
78°
61°
2
77°
61°
3
78°
64°
4
80°
65°
5
82°
65°
6
78°
62°
7
82°
64°
8
84°
65°
9
84°
64°
10
83°
59°
11
81°
58°
12
79°
61°
13
78°
58°
14
80°
58°
15
78°
59°
16
77°
60°
17
76°
61°
18
76°
59°
19
77°
57°
20
77°
57°
21
78°
58°
22
80°
63°
23
78°
62°
24
82°
62°
25
82°
56°
26
81°
56°
27
74°
54°
28
74°
56°
29
75°
58°
30
73°
60°
31
74°
61°
1
78°
58°
2
74°
57°
3
77°
55°
4
74°
54°
5
72°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Cohasset
Cohasset's August 2026 forecast shows daily high temperatures ranging from 72° to 84°, with overnight lows between 54° and 66°. The average high for August is 78° with an average low of 60°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Cohasset. See also: September | October | November.
