S
M
T
W
T
F
S
26
52°
42°
27
52°
41°
28
53°
40°
29
52°
37°
30
55°
39°
1
54°
44°
2
62°
43°
3
57°
39°
4
53°
40°
5
53°
40°
6
56°
39°
7
55°
40°
8
54°
41°
9
55°
42°
10
55°
40°
11
61°
46°
12
60°
43°
13
59°
40°
14
58°
40°
15
57°
41°
16
57°
41°
17
60°
49°
18
67°
49°
19
60°
48°
20
62°
46°
21
64°
49°
22
62°
44°
23
63°
44°
24
68°
45°
25
66°
51°
26
70°
53°
27
71°
52°
28
72°
53°
29
71°
53°
30
71°
52°
31
65°
53°
1
65°
53°
2
66°
54°
3
66°
52°
4
70°
48°
5
71°
56°
6
72°
56°
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 72°, 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.
