S
M
T
W
T
F
S
29
49°
24°
30
65°
43°
31
68°
50°
1
75°
50°
2
50°
40°
3
57°
40°
4
68°
41°
5
56°
41°
6
55°
40°
7
56°
33°
8
46°
29°
9
47°
29°
10
53°
37°
11
62°
46°
12
52°
38°
13
71°
47°
14
80°
55°
15
80°
60°
16
82°
57°
17
74°
51°
18
59°
47°
19
53°
40°
20
48°
35°
21
46°
43°
22
61°
43°
23
60°
44°
24
64°
44°
25
53°
45°
26
57°
45°
27
55°
44°
28
56°
45°
29
57°
48°
30
58°
46°
1
58°
49°
2
60°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in West Islip
West Islip's April 2026 forecast shows daily high temperatures ranging from 46° to 74°, with overnight lows between 35° and 51°. The average high for April is 57° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in West Islip. See also: May | June | July.
