S
M
T
W
T
F
S
27
66°
59°
28
73°
56°
29
65°
53°
30
65°
57°
1
66°
57°
2
65°
54°
3
68°
57°
4
71°
58°
5
72°
58°
6
71°
57°
7
70°
56°
8
65°
55°
9
67°
57°
10
69°
56°
11
70°
54°
12
69°
48°
13
58°
46°
14
57°
45°
15
56°
43°
16
56°
42°
17
57°
51°
18
63°
46°
19
56°
44°
20
56°
42°
21
55°
42°
22
56°
44°
23
62°
53°
24
66°
49°
25
67°
44°
26
62°
41°
27
54°
38°
28
52°
37°
29
50°
37°
30
51°
42°
31
52°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Islip
Islip's October 2026 forecast shows daily high temperatures ranging from 50° to 73°, with overnight lows between 37° and 59°. The average high for October is 62° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Islip. See also: November | December | January.
