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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Tonight
S 14kt
< 1ft
Wednesday
SSE 16kt⇓
< 1ft
Wednesday Night
NNE 6kt⇓
< 1ft
Thursday
W 9kt
< 1ft
Thursday Night
NW 9kt
< 1ft
Friday
WSW 7kt
< 1ft
Friday Night
Light Wind
< 1ft
Saturday
ESE 11kt
< 1ft
Saturday Night
E 8kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 3:50 pm EDT Apr 21, 2026
Forecast Valid: 9pm EDT Apr 21, 2026-6pm EDT Apr 28, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH

Tonight

S wind 12 to 14 kt. A chance of showers, mainly after 11pm. Seas 1 ft or less.

Wednesday

SSE wind 13 to 16 kt decreasing to 8 to 11 kt in the afternoon. Winds could gust as high as 23 kt. A chance of showers, mainly before 11am. Seas 1 ft or less.

Wednesday Night

NNE wind around 6 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas 1 ft or less.

Thursday

W wind 5 to 9 kt. Mostly sunny. Seas 1 ft or less.

Thursday Night

NW wind 7 to 9 kt becoming N after midnight. Mostly cloudy. Seas 1 ft or less.

Friday

NNE wind around 7 kt becoming WSW in the afternoon. Partly sunny. Seas 1 ft or less.

Friday Night

Variable winds 5 kt or less. A chance of showers after 2am. Seas 1 ft or less.

Saturday

ESE wind 8 to 11 kt. A chance of showers. Seas 1 ft or less.

Saturday Night

E wind around 8 kt. A chance of showers. 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.