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Port Jefferson Harbor Entrance, NY Marine Weather Forecast

This Afternoon - 36°F
Dec 05, 2025
5 mph E
Mostly Cloudy
Mostly cloudy. High near 36, with temperatures falling to around 32 in the afternoon. East wind around 5 mph.
Tonight - 34°F
Dec 05, 2025
5 mph E
Chance Light Snow
A slight chance of drizzle between 7pm and 8pm, then a slight chance of snow between 8pm and midnight, then a slight chance of drizzle between midnight and 1am, then a chance of snow and a chance of drizzle. Mostly cloudy. Low around 34, with temperatures rising to around 37 overnight. East wind around 5 mph. Chance of precipitation is 30%.
Saturday - 42°F
Dec 06, 2025
5 to 10 mph N
Chance Drizzle
A chance of drizzle before 1pm. Cloudy, with a high near 42. North wind 5 to 10 mph. Chance of precipitation is 30%.
Saturday Night - 35°F
Dec 06, 2025
9 to 14 mph W
Partly Cloudy
Partly cloudy, with a low around 35. West wind 9 to 14 mph.
Sunday - 39°F
Dec 07, 2025
5 to 8 mph NW
Partly Sunny
Partly sunny, with a high near 39. Northwest wind 5 to 8 mph.
Sunday Night - 30°F
Dec 07, 2025
6 to 22 mph W
Mostly Cloudy then Slight Chance Light Rain
A slight chance of rain after 1am. Mostly cloudy. Low around 30, with temperatures rising to around 34 overnight.
Monday - 32°F
Dec 08, 2025
21 to 24 mph NW
Slight Chance Light Rain then Mostly Sunny
A slight chance of rain before 7am. Mostly sunny, with a high near 32.
Monday Night - 24°F
Dec 08, 2025
8 to 20 mph N
Partly Cloudy
Partly cloudy, with a low around 24.
Tuesday - 38°F
Dec 09, 2025
6 to 16 mph W
Partly Sunny
Partly sunny, with a high near 38.
Tuesday Night - 37°F
Dec 09, 2025
16 to 20 mph SW
Mostly Cloudy
Mostly cloudy, with a low around 37.
Wednesday - 46°F
Dec 10, 2025
15 to 21 mph SW
Mostly Cloudy then Chance Light Rain
A chance of rain after 1pm. Mostly cloudy, with a high near 46. Chance of precipitation is 30%.
Wednesday Night - 40°F
Dec 10, 2025
20 mph SW
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 40. Chance of precipitation is 50%.
Thursday - 43°F
Dec 11, 2025
20 to 23 mph W
Chance Light Rain
A chance of rain. Partly sunny, with a high near 43. Chance of precipitation is 40%.
Thursday Night - 34°F
Dec 11, 2025
24 mph W
Chance Light Rain then Slight Chance Rain And Snow
A chance of rain before 1am, then a slight chance of rain and snow. Mostly cloudy, with a low around 34.

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