Hourly Weather Forecast - Port Jefferson, NY

12 AM
30°F
0%
21mph
WNW
Windy
Humidity
55%
Feels like
18°F
Dew Point
17°F
1 AM
30°F
0%
19mph
WNW
Mostly Clear
Humidity
53%
Feels like
17°F
Dew Point
15°F
2 AM
29°F
0%
18mph
WNW
Mostly Clear
Humidity
53%
Feels like
17°F
Dew Point
14°F
3 AM
28°F
0%
16mph
WNW
Clear
Humidity
54%
Feels like
17°F
Dew Point
14°F
4 AM
28°F
0%
15mph
WNW
Clear
Humidity
54%
Feels like
16°F
Dew Point
13°F
5 AM
27°F
0%
14mph
WNW
Clear
Humidity
55%
Feels like
16°F
Dew Point
13°F
6 AM
27°F
0%
12mph
WNW
Clear
Humidity
55%
Feels like
16°F
Dew Point
13°F
7 AM
27°F
0%
11mph
WNW
Clear
Humidity
56%
Feels like
17°F
Dew Point
13°F
7:12 AM
8 AM
28°F
0%
10mph
WNW
Sunny
Humidity
56%
Feels like
19°F
Dew Point
14°F
9 AM
29°F
0%
8mph
WNW
Sunny
Humidity
53%
Feels like
21°F
Dew Point
14°F
10 AM
30°F
10%
7mph
WNW
Sunny
Humidity
52%
Feels like
22°F
Dew Point
14°F
11 AM
31°F
10%
7mph
W
Mostly Sunny
Humidity
51%
Feels like
24°F
Dew Point
15°F
12 PM
31°F
10%
8mph
W
Partly Cloudy
Humidity
51%
Feels like
24°F
Dew Point
15°F
1 PM
32°F
10%
8mph
W
Mostly Cloudy
Humidity
51%
Feels like
25°F
Dew Point
16°F
2 PM
32°F
10%
8mph
WSW
Cloudy
Humidity
51%
Feels like
25°F
Dew Point
16°F
3 PM
32°F
10%
8mph
WSW
Cloudy
Humidity
53%
Feels like
25°F
Dew Point
17°F
4 PM
32°F
10%
9mph
SW
Cloudy
Humidity
55%
Feels like
24°F
Dew Point
17°F
4:26 PM
5 PM
32°F
10%
9mph
SW
Mostly Cloudy
Humidity
57%
Feels like
24°F
Dew Point
18°F
6 PM
32°F
10%
9mph
SW
Mostly Cloudy
Humidity
59%
Feels like
24°F
Dew Point
19°F
7 PM
32°F
10%
9mph
SSW
Mostly Cloudy
Humidity
62%
Feels like
25°F
Dew Point
21°F
8 PM
33°F
10%
10mph
SSW
Mostly Cloudy
Humidity
66%
Feels like
25°F
Dew Point
23°F
9 PM
34°F
10%
11mph
SW
Mostly Cloudy
Humidity
69%
Feels like
25°F
Dew Point
25°F
10 PM
34°F
10%
12mph
SW
Mostly Cloudy
Humidity
72%
Feels like
26°F
Dew Point
26°F
11 PM
35°F
10%
12mph
SW
Mostly Cloudy
Humidity
72%
Feels like
27°F
Dew Point
27°F

Rainfall Totals Through Wednesday A.M.

Heavy Rain Returns to Deluge Pacific Northwest

Another atmospheric river will hit the Pacific Northwest with heavy rain and high winds.

Monday's Weather Outlook

Today's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

A person standing in a snowy forest with their back to the camera. They are bundled up in a white hat and a brown jacket. (Image by StockSnap from Pixabay)

Common Cold Weather Illnesses

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

Cold Air Damming - Cause And Effects

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