S
M
T
W
T
F
S
26
55°
39°
27
65°
40°
28
63°
40°
29
60°
43°
30
58°
46°
1
63°
40°
2
59°
49°
3
59°
43°
4
65°
46°
5
67°
53°
6
62°
56°
7
64°
45°
8
64°
44°
9
62°
48°
10
67°
52°
11
60°
45°
12
65°
46°
13
65°
51°
14
65°
50°
15
62°
51°
16
70°
56°
17
80°
60°
18
71°
58°
19
75°
64°
20
77°
61°
21
66°
52°
22
61°
53°
23
63°
54°
24
65°
56°
25
66°
57°
26
70°
58°
27
73°
53°
28
64°
52°
29
65°
54°
30
65°
59°
31
72°
58°
1
66°
56°
2
67°
56°
3
66°
55°
4
67°
53°
5
68°
60°
6
71°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Islip Town
Islip Town's May 2026 forecast shows daily high temperatures ranging from 61° to 80°, with overnight lows between 50° and 64°. The average high for May is 68° with an average low of 56°. 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 Islip Town. See also: June | July | August.
