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°
64°
5
78°
66°
6
78°
67°
7
79°
71°
8
80°
69°
9
81°
68°
10
81°
69°
11
82°
68°
12
78°
65°
13
76°
64°
14
75°
65°
15
76°
64°
16
76°
63°
17
74°
62°
18
74°
64°
19
73°
65°
20
73°
65°
21
74°
63°
22
72°
65°
23
75°
66°
24
77°
66°
25
76°
65°
26
72°
64°
27
72°
64°
28
71°
65°
29
73°
64°
30
76°
65°
31
74°
64°
1
76°
62°
2
70°
60°
3
69°
62°
4
69°
61°
5
70°
60°
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 69° to 82°, with overnight lows between 60° and 71°. The average high for August is 75° with an average low of 65°. 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.
