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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]

Juneteenth
SW 13kt
4ft

Small Craft Advisory
Tonight
WNW 16kt
3-4ft

Small Craft Advisory
Saturday
W 19kt
3ft
Saturday Night
WNW 13kt
2-3ft
Sunday
⇑SW 13kt
2ft
Sunday Night
SSW 11kt
2-3ft
Monday
⇑S 26kt
6ft
Monday Night
SSW 25kt⇓
8ft
Tuesday
WNW 13kt
3-4ft

Associated Zone Forecast which includes this point

Last Update: 9:36 am EDT Jun 19, 2026
Forecast Valid: 11am EDT Jun 19, 2026-6pm EDT Jun 25, 2026

View Nearby Observations

Detailed Forecast

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

Juneteenth

SW wind around 13 kt, with gusts as high as 20 kt. Partly sunny. Seas around 4 ft.

Tonight

WNW wind 13 to 16 kt, with gusts as high as 22 kt. Mostly cloudy, then gradually becoming clear. Seas 3 to 4 ft.

Saturday

W wind 15 to 19 kt, with gusts as high as 25 kt. Sunny. Seas around 3 ft.

Saturday Night

WNW wind 8 to 13 kt. Mostly clear. Seas 2 to 3 ft.

Sunday

WNW wind 7 to 10 kt becoming SW 10 to 13 kt in the afternoon. Sunny. Seas around 2 ft.

Sunday Night

SSW wind 6 to 11 kt. A chance of showers after 2am. Seas 2 to 3 ft.

Monday

SE wind 10 to 15 kt becoming S 21 to 26 kt. A chance of showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then rain and possibly a thunderstorm after 2pm. Seas 2 ft building to 6 ft.

Monday Night

SSW wind 22 to 25 kt becoming WSW 17 to 20 kt after midnight. Winds could gust as high as 32 kt. Rain before 8pm, then showers likely, mainly between 8pm and 2am. Seas 8 ft subsiding to 6 ft.

Tuesday

WNW wind 11 to 13 kt becoming W in the afternoon. A chance of showers. Seas 3 to 4 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.