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Port Jefferson, NY Marine Weather Forecast

Overnight - 55°F
Apr 01, 2026
16 mph SW
Slight Chance Rain Showers
A slight chance of rain showers after 2am. Mostly cloudy, with a low around 55. Southwest wind around 16 mph. Chance of precipitation is 20%.
Wednesday - 69°F
Apr 01, 2026
9 to 17 mph W
Chance Rain Showers
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny. High near 69, with temperatures falling to around 64 in the afternoon. West wind 9 to 17 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Wednesday Night - 41°F
Apr 01, 2026
6 to 18 mph NE
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 41, with temperatures rising to around 43 overnight. Northeast wind 6 to 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday - 46°F
Apr 02, 2026
18 mph E
Chance Very Light Rain
A chance of rain before 8am, then a chance of rain and patchy fog between 8am and 2pm. Cloudy. High near 46, with temperatures falling to around 43 in the afternoon. East wind around 18 mph. Chance of precipitation is 40%.
Thursday Night - 39°F
Apr 02, 2026
8 to 16 mph E
Chance Very Light Rain then Areas Of Fog
A chance of rain between 8pm and midnight, then areas of fog and a slight chance of rain. Cloudy. Low around 39, with temperatures rising to around 42 overnight. East wind 8 to 16 mph. Chance of precipitation is 30%.
Friday - 60°F
Apr 03, 2026
6 to 13 mph S
Areas Of Fog then Mostly Cloudy
Areas of fog before noon. Mostly cloudy. High near 60, with temperatures falling to around 54 in the afternoon.
Friday Night - 52°F
Apr 03, 2026
9 to 14 mph SW
Mostly Cloudy
Mostly cloudy, with a low around 52.
Saturday - 62°F
Apr 04, 2026
8 to 13 mph SW
Mostly Sunny then Slight Chance Rain Showers
A slight chance of rain showers after 2pm. Mostly sunny, with a high near 62.
Saturday Night - 49°F
Apr 04, 2026
15 mph S
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a low around 49. Chance of precipitation is 30%.
Sunday - 58°F
Apr 05, 2026
16 mph SW
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a high near 58. Chance of precipitation is 60%.
Sunday Night - 42°F
Apr 05, 2026
15 mph W
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Monday - 50°F
Apr 06, 2026
9 to 15 mph NW
Chance Rain Showers then Mostly Sunny
A chance of rain showers before 8am. Mostly sunny, with a high near 50. Chance of precipitation is 30%.
Monday Night - 40°F
Apr 06, 2026
9 mph NW
Mostly Clear
Mostly clear, with a low around 40.
Tuesday - 49°F
Apr 07, 2026
8 mph E
Mostly Sunny
Mostly sunny, with a high near 49.

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