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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]

Tonight
SW 20kt
4ft

Small Craft Advisory
Wednesday
⇑SSW 21kt
3-4ft
Wednesday Night
SSW 24kt⇓
6ft
Thursday
SSW 16kt
3ft
Thursday Night
SSW 19kt⇓
3-4ft
Friday
⇑SSW 15kt
2-3ft
Friday Night
SW 10kt
2-3ft
Independence Day
⇑SSW 13kt
2ft
Saturday Night
WSW 9kt
2ft

Associated Zone Forecast which includes this point

Last Update: 2:25 pm EDT Jun 30, 2026
Forecast Valid: 7pm EDT Jun 30, 2026-6pm EDT Jul 7, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

Tonight

SW wind 15 to 20 kt, with gusts as high as 27 kt. A slight chance of showers and thunderstorms after 11pm. Seas around 4 ft.

Wednesday

SSW wind 14 to 17 kt increasing to 18 to 21 kt in the afternoon. Sunny. Seas 3 to 4 ft.

Wednesday Night

SSW wind 21 to 24 kt decreasing to 17 to 20 kt after midnight. Winds could gust as high as 30 kt. A chance of showers and thunderstorms, mainly after 11pm. Seas 6 ft subsiding to 4 ft.

Thursday

SSW wind 12 to 16 kt, with gusts as high as 22 kt. Partly sunny through mid morning, then becoming sunny. Seas around 3 ft.

Thursday Night

SSW wind 16 to 19 kt decreasing to 12 to 15 kt after midnight. Mostly clear. Seas 3 to 4 ft.

Friday

W wind 8 to 11 kt becoming SSW 12 to 15 kt in the afternoon. Sunny. Seas 2 to 3 ft.

Friday Night

SW wind 6 to 10 kt becoming WNW after midnight. Partly cloudy. Seas 2 to 3 ft.

Independence Day

Variable winds less than 5 kt becoming SSW 8 to 13 kt in the morning. A chance of showers and thunderstorms after 2pm. Seas around 2 ft.

Saturday Night

WSW wind 5 to 9 kt. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 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.