S
M
T
W
T
F
S
26
82°
60°
27
80°
58°
28
79°
58°
29
79°
59°
30
80°
59°
31
79°
58°
1
79°
60°
2
80°
60°
3
78°
61°
4
80°
64°
5
81°
59°
6
82°
62°
7
84°
62°
8
83°
63°
9
80°
59°
10
79°
58°
11
80°
59°
12
78°
58°
13
78°
60°
14
77°
60°
15
76°
61°
16
77°
59°
17
78°
59°
18
78°
62°
19
83°
63°
20
83°
63°
21
82°
62°
22
83°
62°
23
82°
61°
24
82°
57°
25
81°
57°
26
75°
59°
27
76°
60°
28
79°
61°
29
76°
60°
30
79°
63°
31
80°
62°
1
80°
56°
2
73°
55°
3
74°
57°
4
Hist. Avg.
77°
56°
5
Hist. Avg.
77°
56°
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 73° to 84°, with overnight lows between 55° and 64°. The average high for August is 79° 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.
