S
M
T
W
T
F
S
26
71°
63°
27
73°
62°
28
75°
63°
29
69°
64°
30
70°
66°
31
76°
65°
1
74°
66°
2
77°
67°
3
77°
69°
4
79°
61°
5
77°
60°
6
77°
70°
7
81°
71°
8
79°
70°
9
82°
71°
10
80°
64°
11
80°
71°
12
79°
64°
13
77°
66°
14
77°
62°
15
77°
58°
16
74°
56°
17
70°
66°
18
77°
63°
19
77°
63°
20
78°
66°
21
72°
66°
22
70°
67°
23
77°
66°
24
78°
66°
25
74°
66°
26
77°
62°
27
76°
63°
28
78°
69°
29
75°
61°
30
78°
63°
31
72°
63°
1
68°
62°
2
72°
64°
3
74°
66°
4
78°
63°
5
68°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Nantucket
Nantucket's August 2026 forecast shows daily high temperatures ranging from 68° to 78°, with overnight lows between 61° and 66°. The average high for August is 72° 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 Nantucket. See also: September | October | November.
