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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Tonight
SW 18kt⇓
< 1ft
Thursday
S 12kt
< 1ft
Thursday Night
SSW 13kt⇓
< 1ft
Friday
⇑SW 11kt
< 1ft
Friday Night
W 7kt
< 1ft
Independence Day
SW 10kt
< 1ft
Saturday Night
Light Wind
< 1ft
Sunday
⇑S 8kt
< 1ft
Sunday Night
Light Wind
< 1ft

Associated Zone Forecast which includes this point

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

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Detailed Forecast

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

Tonight

SW wind 15 to 18 kt decreasing to 10 to 13 kt after midnight. A slight chance of showers and thunderstorms before 11pm. Seas 1 ft or less.

Thursday

SW wind 7 to 12 kt becoming S in the afternoon. Sunny. Seas 1 ft or less.

Thursday Night

SSW wind 10 to 13 kt becoming W 6 to 9 kt after midnight. Clear. Seas 1 ft or less.

Friday

W wind 5 to 8 kt becoming SW 8 to 11 kt in the afternoon. A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Seas 1 ft or less.

Friday Night

W wind 5 to 7 kt becoming NW after midnight. A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Seas 1 ft or less.

Independence Day

WNW wind 5 to 10 kt becoming SW in the afternoon. A chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Saturday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms before 2am. Seas 1 ft or less.

Sunday

Variable winds less than 5 kt becoming S 5 to 8 kt in the morning. A chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Sunday Night

Variable winds 5 kt or less. 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 1 ft or less.

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.