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Port Jefferson, NY Marine Weather Forecast

This Afternoon - 47°F
Dec 18, 2025
9 mph SE
Sunny
Sunny. High near 47, with temperatures falling to around 45 in the afternoon. Southeast wind around 9 mph.
Tonight - 45°F
Dec 18, 2025
9 to 23 mph SE
Light Rain
Rain after 10pm. Mostly cloudy. Low around 45, with temperatures rising to around 54 overnight. Southeast wind 9 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Friday - 56°F
Dec 19, 2025
23 to 29 mph SW
Rain
Rain before 7am, then rain and a slight chance of thunderstorms between 7am and 4pm. Mostly cloudy. High near 56, with temperatures falling to around 45 in the afternoon. Southwest wind 23 to 29 mph, with gusts as high as 52 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Friday Night - 31°F
Dec 19, 2025
18 to 28 mph W
Partly Cloudy
Partly cloudy, with a low around 31. Wind chill values as low as 20. West wind 18 to 28 mph, with gusts as high as 47 mph. New rainfall amounts less than a tenth of an inch possible.
Saturday - 42°F
Dec 20, 2025
8 to 16 mph W
Mostly Sunny
Mostly sunny. High near 42, with temperatures falling to around 38 in the afternoon. West wind 8 to 16 mph.
Saturday Night - 37°F
Dec 20, 2025
9 to 16 mph SW
Mostly Cloudy
Mostly cloudy. Low around 37, with temperatures rising to around 42 overnight.
Sunday - 45°F
Dec 21, 2025
18 to 28 mph W
Mostly Sunny
Mostly sunny, with a high near 45.
Sunday Night - 28°F
Dec 21, 2025
24 to 29 mph NW
Mostly Clear
Mostly clear, with a low around 28.
Monday - 34°F
Dec 22, 2025
14 to 23 mph NW
Sunny
Sunny, with a high near 34.
Monday Night - 28°F
Dec 22, 2025
9 to 14 mph W
Partly Cloudy
Partly cloudy, with a low around 28.
Tuesday - 41°F
Dec 23, 2025
10 to 20 mph SW
Chance Rain And Snow
A chance of rain and snow after 7am. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.
Tuesday Night - 36°F
Dec 23, 2025
21 mph W
Chance Rain And Snow then Mostly Cloudy
A chance of rain and snow before 7pm. Mostly cloudy, with a low around 36. Chance of precipitation is 50%.
Wednesday - 42°F
Dec 24, 2025
13 to 17 mph NW
Mostly Sunny
Mostly sunny, with a high near 42.
Wednesday Night - 33°F
Dec 24, 2025
13 mph N
Mostly Cloudy then Slight Chance Rain And Snow
A slight chance of rain and snow after 1am. Mostly cloudy, with a low around 33.

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