S
M
T
W
T
F
S
26
84°
65°
27
83°
64°
28
80°
65°
29
85°
65°
30
87°
66°
31
85°
66°
1
86°
65°
2
85°
66°
3
85°
65°
4
84°
60°
5
83°
59°
6
79°
58°
7
80°
62°
8
83°
65°
9
83°
64°
10
84°
62°
11
79°
65°
12
79°
59°
13
78°
61°
14
78°
59°
15
Hist. Avg.
81°
60°
16
Hist. Avg.
81°
60°
17
Hist. Avg.
81°
60°
18
Hist. Avg.
81°
60°
19
Hist. Avg.
80°
59°
20
Hist. Avg.
80°
59°
21
Hist. Avg.
80°
59°
22
Hist. Avg.
80°
59°
23
Hist. Avg.
80°
59°
24
Hist. Avg.
80°
59°
25
Hist. Avg.
80°
58°
26
Hist. Avg.
79°
58°
27
Hist. Avg.
79°
58°
28
Hist. Avg.
79°
58°
29
Hist. Avg.
79°
58°
30
Hist. Avg.
78°
57°
31
Hist. Avg.
78°
57°
1
Hist. Avg.
78°
57°
2
Hist. Avg.
78°
57°
3
Hist. Avg.
78°
56°
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
*Temporarily Unavailable
August Weather in Cohasset
Cohasset's August 2026 forecast shows daily high temperatures ranging from 78° to 87°, with overnight lows between 58° and 66°. The average high for August is 83° with an average low of 63°. 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.
