S
M
T
W
T
F
S
26
82°
59°
27
82°
57°
28
73°
63°
29
81°
61°
30
68°
54°
1
68°
48°
2
68°
46°
3
70°
43°
4
79°
43°
5
79°
52°
6
72°
64°
7
70°
52°
8
72°
48°
9
75°
54°
10
82°
59°
11
79°
55°
12
77°
54°
13
81°
55°
14
75°
50°
15
81°
45°
16
81°
54°
17
91°
59°
18
90°
63°
19
90°
68°
20
88°
66°
21
79°
68°
22
77°
68°
23
86°
68°
24
79°
70°
25
81°
70°
26
84°
72°
27
86°
72°
28
90°
70°
29
81°
69°
30
81°
67°
31
78°
64°
1
85°
65°
2
85°
57°
3
83°
58°
4
81°
62°
5
82°
66°
6
81°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Long Island
Long Island's May 2026 forecast shows daily high temperatures ranging from 78° to 85°, with overnight lows between 57° and 69°. The average high for May is 82° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Long Island. See also: June | July | August.
