S
M
T
W
T
F
S
26
56°
47°
27
56°
46°
28
57°
45°
29
57°
45°
30
58°
43°
1
58°
51°
2
67°
51°
3
62°
48°
4
59°
45°
5
59°
43°
6
61°
47°
7
60°
48°
8
59°
50°
9
61°
48°
10
60°
45°
11
61°
45°
12
62°
50°
13
63°
47°
14
62°
50°
15
63°
48°
16
62°
49°
17
64°
56°
18
71°
56°
19
69°
55°
20
65°
52°
21
65°
53°
22
67°
50°
23
67°
50°
24
68°
51°
25
67°
53°
26
74°
54°
27
73°
55°
28
75°
58°
29
76°
58°
30
76°
57°
31
70°
59°
1
69°
59°
2
69°
58°
3
70°
55°
4
77°
57°
5
77°
61°
6
78°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in West Islip
West Islip's May 2026 forecast shows daily high temperatures ranging from 56° to 78°, with overnight lows between 43° and 62°. The average high for May is 65° with an average low of 51°. 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 West Islip. See also: June | July | August.
