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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]

This Afternoon
SSW 18kt
4ft

Small Craft Advisory
Tonight
SSW 22kt⇓
4-5ft

Small Craft Advisory
Thursday
SW 15kt
3ft
Thursday Night
SSW 18kt⇓
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

Associated Zone Forecast which includes this point

Last Update: 2:10 pm EDT Jul 1, 2026
Forecast Valid: 3pm EDT Jul 1, 2026-6pm EDT Jul 8, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

This Afternoon

SSW wind around 18 kt. A slight chance of showers and thunderstorms after 5pm. Seas around 4 ft.

Tonight

SSW wind 19 to 22 kt decreasing to 15 to 18 kt after midnight. A slight chance of showers and thunderstorms before 11pm. Seas 4 to 5 ft.

Thursday

SW wind 10 to 15 kt. Sunny. Seas around 3 ft.

Thursday Night

SSW wind 13 to 18 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 before 8pm. 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.

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.