S
M
T
W
T
F
S
27
76°
53°
28
78°
45°
29
69°
43°
30
68°
43°
1
68°
46°
2
76°
47°
3
76°
50°
4
75°
50°
5
76°
49°
6
75°
51°
7
76°
49°
8
75°
40°
9
73°
42°
10
65°
40°
11
63°
47°
12
64°
48°
13
67°
50°
14
71°
50°
15
73°
49°
16
71°
44°
17
70°
37°
18
69°
37°
19
59°
35°
20
59°
37°
21
57°
45°
22
64°
43°
23
67°
38°
24
64°
34°
25
55°
33°
26
54°
42°
27
59°
41°
28
62°
32°
29
60°
30°
30
51°
31°
31
65°
35°
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 51° to 78°, with overnight lows between 30° and 53°. The average high for October is 67° with an average low of 42°. 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.
