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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]

Today
ESE 15kt
2-3ft
Tonight
⇑ESE 26kt
6ft

Small Craft Advisory
Monday
S 30kt
11ft
Monday Night
S 39kt⇓
15ft
Tuesday
W 28kt
10ft
Tuesday Night
WNW 26kt⇓
8ft
Wednesday
NW 11kt
4-5ft
Wednesday Night
S 12kt
4ft
Thursday
SE 11kt
3-4ft

Associated Zone Forecast which includes this point

Last Update: 6:56 am EDT Mar 15, 2026
Forecast Valid: 8am EDT Mar 15, 2026-6pm EDT Mar 21, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH LATE

Today

ENE wind 11 to 15 kt becoming ESE in the afternoon. Partly sunny. Seas 2 to 3 ft.

Tonight

ESE wind 16 to 21 kt increasing to 21 to 26 kt after midnight. Showers, with thunderstorms also possible after 5am. Patchy fog after 2am. Seas 3 ft building to 6 ft.

Monday

S wind 26 to 30 kt, with gusts as high as 39 kt. Scattered showers and thunderstorms. Areas of fog before noon. Seas 8 ft building to 11 ft.

Monday Night

S wind 36 to 39 kt becoming W 31 to 34 kt after midnight. Winds could gust as high as 47 kt. Periods of rain showers before 5am, then a chance of rain and snow showers. The rain could be heavy at times. Some thunder is also possible. Seas 15 ft subsiding to 12 ft.

Tuesday

W wind 24 to 28 kt. A chance of rain and snow showers before 8am. Seas 10 ft subsiding to 8 ft.

Tuesday Night

WNW wind 23 to 26 kt decreasing to 17 to 20 kt after midnight. Partly cloudy. Seas 8 ft subsiding to 6 ft.

Wednesday

NW wind 6 to 11 kt becoming SSW in the afternoon. Increasing clouds. Seas 4 to 5 ft.

Wednesday Night

S wind 10 to 12 kt. Mostly cloudy. Seas around 4 ft.

Thursday

SE wind 9 to 11 kt. Partly sunny. Seas 3 to 4 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.