S
M
T
W
T
F
S
26
54°
42°
27
52°
41°
28
55°
39°
29
52°
43°
30
53°
42°
1
53°
44°
2
54°
42°
3
53°
39°
4
52°
38°
5
53°
37°
6
55°
38°
7
58°
42°
8
58°
45°
9
60°
46°
10
62°
46°
11
56°
40°
12
55°
41°
13
56°
41°
14
55°
43°
15
57°
41°
16
58°
44°
17
58°
42°
18
59°
46°
19
58°
45°
20
60°
43°
21
62°
49°
22
66°
50°
23
65°
51°
24
63°
52°
25
69°
52°
26
63°
51°
27
62°
52°
28
70°
54°
29
72°
50°
30
68°
47°
31
64°
49°
1
65°
48°
2
71°
52°
3
72°
55°
4
75°
56°
5
75°
56°
6
74°
48°
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 52° to 75°, with overnight lows between 37° and 56°. The average high for May is 61° with an average low of 46°. 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.
