S
M
T
W
T
F
S
26
83°
70°
27
84°
71°
28
85°
70°
29
83°
71°
30
85°
72°
31
86°
72°
1
85°
71°
2
84°
69°
3
80°
65°
4
80°
67°
5
81°
67°
6
79°
66°
7
81°
70°
8
84°
70°
9
85°
71°
10
85°
71°
11
84°
70°
12
84°
70°
13
85°
71°
14
85°
69°
15
85°
71°
16
81°
71°
17
80°
70°
18
85°
72°
19
84°
71°
20
83°
65°
21
84°
63°
22
79°
63°
23
78°
65°
24
79°
66°
25
78°
63°
26
79°
69°
27
78°
64°
28
79°
63°
29
77°
63°
30
77°
62°
31
78°
62°
1
76°
63°
2
76°
63°
3
75°
64°
4
74°
63°
5
75°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Setauket
Setauket's August 2026 forecast shows daily high temperatures ranging from 74° to 86°, with overnight lows between 62° and 72°. The average high for August is 81° with an average low of 67°. 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 Setauket. See also: September | October | November.
