Hourly Weather Forecast - Port Jefferson, NY

12 AM
40°F
10%
13mph
SW
Partly Cloudy
Humidity
87%
Feels like
33°F
Dew Point
37°F
1 AM
40°F
10%
14mph
WSW
Partly Cloudy
Humidity
84%
Feels like
32°F
Dew Point
36°F
2 AM
40°F
10%
15mph
WSW
Partly Cloudy
Humidity
84%
Feels like
31°F
Dew Point
35°F
3 AM
39°F
0%
16mph
W
Partly Cloudy
Humidity
83%
Feels like
30°F
Dew Point
34°F
4 AM
37°F
0%
17mph
W
Partly Cloudy
Humidity
81%
Feels like
28°F
Dew Point
32°F
5 AM
36°F
0%
18mph
WNW
Partly Cloudy
Humidity
76%
Feels like
26°F
Dew Point
29°F
6 AM
35°F
0%
20mph
WNW
Partly Cloudy
Humidity
71%
Feels like
24°F
Dew Point
26°F
7 AM
34°F
0%
20mph
WNW
Mostly Clear
Humidity
66%
Feels like
23°F
Dew Point
24°F
7:06 AM
8 AM
33°F
0%
20mph
WNW
Windy
Humidity
62%
Feels like
22°F
Dew Point
22°F
9 AM
33°F
0%
21mph
WNW
Windy
Humidity
54%
Feels like
21°F
Dew Point
18°F
10 AM
33°F
0%
22mph
WNW
Windy
Humidity
50%
Feels like
20°F
Dew Point
16°F
11 AM
33°F
0%
22mph
WNW
Windy
Humidity
47%
Feels like
21°F
Dew Point
15°F
12 PM
33°F
0%
22mph
WNW
Windy
Humidity
45%
Feels like
20°F
Dew Point
14°F
1 PM
33°F
10%
22mph
WNW
Windy
Humidity
44%
Feels like
20°F
Dew Point
13°F
2 PM
32°F
10%
22mph
W
Windy
Humidity
45%
Feels like
20°F
Dew Point
13°F
3 PM
31°F
20%
22mph
W
Windy
Humidity
47%
Feels like
19°F
Dew Point
13°F
4 PM
31°F
20%
21mph
W
Windy
Humidity
48%
Feels like
18°F
Dew Point
13°F
4:24 PM
5 PM
30°F
30%
21mph
W
30% Chance of Snow
Humidity
51%
Feels like
17°F
Dew Point
14°F
6 PM
30°F
30%
21mph
W
30 % Chance of Heavy Snow
Humidity
52%
Feels like
17°F
Dew Point
15°F
7 PM
30°F
20%
21mph
W
Windy
Humidity
53%
Feels like
17°F
Dew Point
15°F
8 PM
30°F
10%
21mph
W
Windy
Humidity
53%
Feels like
17°F
Dew Point
15°F
9 PM
29°F
10%
20mph
W
Windy
Humidity
54%
Feels like
17°F
Dew Point
15°F
10 PM
29°F
0%
21mph
W
Windy
Humidity
54%
Feels like
16°F
Dew Point
14°F
11 PM
29°F
0%
20mph
WNW
Windy
Humidity
54%
Feels like
15°F
Dew Point
14°F

Snow and ice forecast through Thursday A.M.

Snow Barrels Across the Northern U.S.

Low pressure will produce a swath of snow from Minnesota to Maine into Thursday.

Rainfall Forecast for Northwest through Thursday

Heavy Rain, Flooding Soaks The Northwest

Wednesday's Weather Outlook

Wednesday's Weather Outlook

Weekly Drought Map for December 4, 2025

Active Week of Weather Leads to Mixed Drought Results

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

People skating on a frozen pond on a clear day. (Image by Q K from Pixabay)

Safety Tips For Icy Surfaces

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

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Outdoor Sports Guide