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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]

Tonight
SW 20kt⇓
4-5ft

Small Craft Advisory
Thursday
SSW 15kt
3ft

Small Craft Advisory
Thursday Night
SSW 19kt⇓
3-4ft
Friday
⇑SW 14kt
2-3ft
Friday Night
WSW 10kt
2-3ft
Independence Day
⇑SW 12kt
2ft
Saturday Night
WNW 8kt
2ft
Sunday
SSE 10kt
2ft
Sunday Night
SSE 8kt
2ft

Associated Zone Forecast which includes this point

Last Update: 8:17 pm EDT Jul 1, 2026
Forecast Valid: 9pm EDT Jul 1, 2026-6pm EDT Jul 8, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING...

Tonight

SW wind 17 to 20 kt decreasing to 13 to 16 kt after midnight. Isolated showers and thunderstorms. Seas 4 to 5 ft.

Thursday

SSW wind 10 to 15 kt, with gusts as high as 21 kt. Sunny. Seas around 3 ft.

Thursday Night

SSW wind 14 to 19 kt becoming WSW 8 to 11 kt after midnight. Clear. Seas 3 to 4 ft.

Friday

W wind 6 to 9 kt becoming SW 11 to 14 kt in the afternoon. A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Seas 2 to 3 ft.

Friday Night

WSW wind 6 to 10 kt becoming WNW after midnight. A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Seas 2 to 3 ft.

Independence Day

WNW wind 6 to 9 kt becoming SW 9 to 12 kt in the afternoon. A chance of showers and thunderstorms after 2pm. Seas around 2 ft.

Saturday Night

WNW wind 6 to 8 kt. A chance of showers and thunderstorms before 2am. Seas around 2 ft.

Sunday

NNW wind 6 to 10 kt becoming SSE in the afternoon. A chance of showers and thunderstorms after 2pm. Seas around 2 ft.

Sunday Night

SSE wind 5 to 8 kt becoming S after midnight. A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Seas around 2 ft.

Winds and seas may be higher in and near tstms.

*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.