S
M
T
W
T
F
S
26
81°
48°
27
79°
55°
28
80°
71°
29
77°
66°
30
75°
63°
31
83°
58°
1
82°
72°
2
82°
72°
3
78°
64°
4
83°
57°
5
82°
54°
6
84°
76°
7
88°
70°
8
86°
66°
9
91°
66°
10
86°
63°
11
86°
64°
12
85°
68°
13
83°
62°
14
83°
61°
15
79°
60°
16
77°
69°
17
80°
62°
18
77°
61°
19
80°
65°
20
79°
62°
21
78°
61°
22
78°
61°
23
79°
60°
24
80°
58°
25
77°
56°
26
78°
64°
27
80°
65°
28
73°
58°
29
73°
58°
30
76°
64°
31
78°
64°
1
74°
63°
2
77°
64°
3
79°
64°
4
79°
63°
5
77°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sag Harbor
Sag Harbor's August 2026 forecast shows daily high temperatures ranging from 73° to 85°, with overnight lows between 56° and 69°. The average high for August is 78° with an average low of 62°. 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 Sag Harbor. See also: September | October | November.
