S
M
T
W
T
F
S
27
67°
59°
28
62°
57°
29
72°
56°
30
70°
60°
1
72°
64°
2
79°
58°
3
70°
56°
4
65°
57°
5
71°
49°
6
60°
45°
7
62°
54°
8
67°
56°
9
69°
55°
10
66°
53°
11
64°
54°
12
65°
56°
13
65°
54°
14
66°
49°
15
59°
44°
16
61°
48°
17
68°
53°
18
68°
53°
19
64°
52°
20
66°
51°
21
64°
48°
22
58°
47°
23
59°
48°
24
66°
51°
25
66°
51°
26
65°
46°
27
56°
44°
28
57°
42°
29
60°
47°
30
60°
45°
31
59°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Port Jefferson
Port Jefferson's October 2026 forecast shows daily high temperatures ranging from 56° to 79°, with overnight lows between 42° and 64°. The average high for October is 64° 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 October weather will actually feel in Port Jefferson. See also: November | December | January.
