S
M
T
W
T
F
S
26
84°
68°
27
84°
68°
28
83°
67°
29
83°
68°
30
82°
67°
31
77°
64°
1
77°
63°
2
78°
63°
3
78°
65°
4
79°
63°
5
77°
63°
6
77°
65°
7
78°
67°
8
77°
66°
9
78°
65°
10
82°
60°
11
81°
61°
12
82°
62°
13
81°
65°
14
82°
66°
15
83°
65°
16
83°
66°
17
84°
66°
18
83°
65°
19
82°
60°
20
80°
59°
21
76°
58°
22
76°
58°
23
77°
57°
24
76°
59°
25
78°
58°
26
81°
58°
27
80°
59°
28
78°
62°
29
76°
62°
30
75°
61°
31
80°
63°
1
79°
55°
2
80°
56°
3
73°
55°
4
74°
56°
5
76°
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 84°, with overnight lows between 55° and 68°. The average high for August is 79° 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.
