S
M
T
W
T
F
S
26
85°
64°
27
84°
62°
28
82°
61°
29
83°
62°
30
82°
61°
31
81°
62°
1
79°
61°
2
80°
61°
3
82°
62°
4
82°
61°
5
78°
61°
6
80°
60°
7
78°
61°
8
76°
60°
9
78°
61°
10
81°
62°
11
81°
60°
12
80°
57°
13
79°
59°
14
81°
61°
15
79°
57°
16
82°
50°
17
72°
49°
18
70°
48°
19
71°
50°
20
72°
51°
21
74°
52°
22
75°
54°
23
74°
57°
24
76°
58°
25
77°
49°
26
72°
48°
27
69°
49°
28
74°
55°
29
79°
58°
30
78°
56°
31
80°
47°
1
71°
47°
2
70°
55°
3
69°
57°
4
76°
47°
5
76°
44°
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 69° to 85°, with overnight lows between 44° and 64°. The average high for August is 77° 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 August weather will actually feel in Cohasset. See also: September | October | November.
