S
M
T
W
T
F
S
29
63°
33°
30
73°
56°
31
77°
62°
1
66°
37°
2
78°
39°
3
80°
64°
4
79°
45°
5
46°
36°
6
55°
33°
7
44°
30°
8
64°
29°
9
77°
54°
10
68°
51°
11
62°
42°
12
80°
47°
13
81°
68°
14
82°
62°
15
82°
68°
16
77°
62°
17
83°
54°
18
70°
46°
19
55°
38°
20
52°
35°
21
77°
40°
22
79°
58°
23
82°
58°
24
80°
57°
25
69°
43°
26
68°
51°
27
78°
62°
28
74°
50°
29
67°
41°
30
61°
40°
1
60°
40°
2
58°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Port Jefferson
Port Jefferson's April 2026 forecast shows daily high temperatures ranging from 58° to 80°, with overnight lows between 38° and 62°. The average high for April is 68° with an average low of 47°. 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 Port Jefferson. See also: May | June | July.
