S
M
T
W
T
F
S
27
76°
57°
28
75°
49°
29
73°
49°
30
64°
54°
1
63°
50°
2
65°
55°
3
63°
53°
4
65°
52°
5
70°
57°
6
70°
57°
7
69°
56°
8
67°
55°
9
69°
51°
10
68°
46°
11
61°
53°
12
63°
46°
13
68°
44°
14
58°
45°
15
60°
51°
16
64°
49°
17
66°
47°
18
62°
46°
19
58°
43°
20
57°
44°
21
55°
46°
22
57°
45°
23
56°
44°
24
65°
49°
25
Hist. Avg.
61°
44°
26
Hist. Avg.
61°
44°
27
Hist. Avg.
60°
43°
28
Hist. Avg.
60°
43°
29
Hist. Avg.
60°
43°
30
Hist. Avg.
59°
42°
31
Hist. Avg.
59°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
October Weather in Islip
Islip's October 2026 forecast shows daily high temperatures ranging from 55° to 76°, with overnight lows between 43° and 57°. The average high for October is 65° with an average low of 50°. 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.
