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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]

This Afternoon
E 19kt
5ft

Small Craft Advisory
Tonight
W 13kt
4ft
Saturday
W 12kt
3-4ft
Saturday Night
⇑E 14kt
2-3ft
Sunday
⇑E 24kt
5ft
Sunday Night
⇑NNE 35kt
8ft
Monday
N 35kt⇓
9ft
Monday Night
NW 19kt
8ft
Tuesday
NW 19kt
4-5ft

Associated Zone Forecast which includes this point

Last Update: 1:05 pm EST Feb 20, 2026
Forecast Valid: 1pm EST Feb 20, 2026-6pm EST Feb 26, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON...

This Afternoon

E wind 16 to 19 kt. Rain. Seas around 5 ft.

Tonight

NE wind 9 to 13 kt becoming W after midnight. A chance of rain before 3am, then a slight chance of rain and snow. Seas around 4 ft.

Saturday

W wind 8 to 12 kt becoming NW in the afternoon. A slight chance of snow before 7am. Seas 3 to 4 ft.

Saturday Night

Variable winds less than 5 kt becoming E 9 to 14 kt in the evening. A slight chance of rain before 1am, then a chance of rain and snow between 1am and 4am, then a chance of snow after 4am. Seas 2 to 3 ft.

Sunday

E wind 16 to 19 kt increasing to 21 to 24 kt in the afternoon. Winds could gust as high as 30 kt. Snow. Seas 3 ft building to 5 ft.

Sunday Night

ENE wind 27 to 30 kt becoming NNE 32 to 35 kt after midnight. Winds could gust as high as 45 kt. Snow. The snow could be heavy at times. Seas 6 ft building to 8 ft.

Monday

N wind 30 to 35 kt becoming NNW 23 to 28 kt. Winds could gust as high as 45 kt. Snow, mainly before 1pm. Seas around 9 ft.

Monday Night

NW wind around 19 kt, with gusts as high as 27 kt. Mostly cloudy. Seas 8 ft subsiding to 5 ft.

Tuesday

NW wind 16 to 19 kt, with gusts as high as 27 kt. Mostly sunny. Seas 4 to 5 ft.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.