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
58°
41°
3
61°
44°
4
65°
52°
5
69°
56°
6
63°
53°
7
60°
46°
8
60°
43°
9
61°
46°
10
61°
50°
11
63°
51°
12
63°
49°
13
64°
51°
14
64°
52°
15
63°
50°
16
71°
55°
17
72°
54°
18
72°
55°
19
71°
55°
20
71°
54°
21
69°
55°
22
70°
51°
23
65°
48°
24
64°
51°
25
66°
49°
26
66°
53°
27
67°
50°
28
66°
52°
29
67°
50°
30
67°
51°
31
68°
59°
1
72°
58°
2
70°
54°
3
69°
58°
4
74°
60°
5
72°
58°
6
71°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Central Islip
Central Islip's May 2026 forecast shows daily high temperatures ranging from 58° to 74°, with overnight lows between 41° and 60°. The average high for May is 67° with an average low of 52°. 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 Central Islip. See also: June | July | August.
