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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Tonight
SSW 8kt⇓
< 1ft
Wednesday
⇑S 15kt
< 1ft
Wednesday Night
SW 22kt
< 1ft
Thursday
WSW 14kt
< 1ft
Thursday Night
W 9kt
< 1ft
Friday
NNW 9kt
< 1ft
Friday Night
Light Wind
< 1ft
Saturday
SSE 9kt
< 1ft
Saturday Night
SSE 9kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 2:19 pm EDT Sep 8, 2026
Forecast Valid: 4pm EDT Sep 8, 2026-6pm EDT Sep 15, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY EVENING THROUGH

Tonight

SSW wind 5 to 8 kt becoming variable and less than 5 kt. Partly cloudy. Seas 1 ft or less.

Wednesday

Variable winds less than 5 kt becoming S 10 to 15 kt in the morning. Mostly sunny. Seas 1 ft or less.

Wednesday Night

SW wind 19 to 22 kt. Partly cloudy. Seas 1 ft or less.

Thursday

WSW wind 11 to 14 kt. A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Seas 1 ft or less.

Thursday Night

W wind around 9 kt becoming NNW after midnight. A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Seas 1 ft or less.

Friday

NNW wind 5 to 9 kt. Sunny. Seas 1 ft or less.

Friday Night

Variable winds 5 kt or less. Mostly clear. Seas 1 ft or less.

Saturday

ENE wind 5 to 9 kt becoming SSE in the afternoon. Mostly sunny. Seas 1 ft or less.

Saturday Night

SSE wind around 9 kt. Mostly cloudy. Seas 1 ft or less.

*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.