S
M
T
W
T
F
S
26
80°
64°
27
80°
64°
28
81°
65°
29
81°
64°
30
82°
64°
31
82°
69°
1
85°
70°
2
86°
70°
3
86°
69°
4
87°
69°
5
86°
63°
6
82°
63°
7
78°
64°
8
79°
64°
9
81°
65°
10
81°
66°
11
82°
66°
12
83°
67°
13
82°
68°
14
85°
69°
15
83°
69°
16
85°
68°
17
85°
68°
18
83°
65°
19
79°
63°
20
78°
63°
21
78°
67°
22
79°
68°
23
78°
64°
24
82°
66°
25
82°
68°
26
81°
64°
27
82°
62°
28
80°
65°
29
77°
67°
30
82°
66°
31
82°
67°
1
81°
66°
2
82°
67°
3
81°
63°
4
82°
59°
5
80°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Smithtown
Smithtown's August 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 59° and 70°. The average high for August is 82° with an average low of 66°. 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 Smithtown. See also: September | October | November.
