S
M
T
W
T
F
S
26
69°
43°
27
69°
48°
28
71°
55°
29
72°
53°
30
75°
44°
31
71°
55°
1
69°
53°
2
70°
55°
3
70°
50°
4
70°
48°
5
71°
48°
6
72°
52°
7
72°
51°
8
73°
43°
9
71°
52°
10
74°
53°
11
76°
51°
12
74°
47°
13
74°
47°
14
75°
50°
15
71°
52°
16
73°
56°
17
71°
57°
18
68°
53°
19
71°
53°
20
71°
53°
21
72°
51°
22
72°
52°
23
72°
50°
24
73°
59°
25
74°
58°
26
78°
62°
27
79°
53°
28
74°
57°
29
74°
58°
30
74°
55°
31
72°
54°
1
74°
55°
2
73°
52°
3
76°
53°
4
85°
57°
5
86°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Long Island
Long Island's August 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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 Long Island. See also: September | October | November.
