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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Today
SSW 12kt
< 1ft
Tonight
SW 11kt⇓
< 1ft
Monday
⇑SSE 6kt
< 1ft
Monday Night
S 6kt
< 1ft
Tuesday
SSW 8kt
< 1ft
Tuesday Night
S 8kt
< 1ft
Wednesday
ESE 9kt
< 1ft
Wednesday Night
ESE 7kt
< 1ft
Thursday
SSW 8kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 7:25 am EDT Aug 30, 2026
Forecast Valid: 11am EDT Aug 30, 2026-6pm EDT Sep 5, 2026

View Nearby Observations

Detailed Forecast

Today

SSW wind 9 to 12 kt. A slight chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Seas 1 ft or less.

Tonight

SW wind 6 to 11 kt becoming variable and less than 5 kt after midnight. Showers and thunderstorms likely before 2am, then a chance of showers. Seas 1 ft or less.

Monday

Variable winds less than 5 kt becoming SSE around 6 kt in the afternoon. A slight chance of showers before 8am. Seas 1 ft or less.

Monday Night

S wind around 6 kt becoming SSW after midnight. Showers likely, mainly after 2am. Seas 1 ft or less.

Tuesday

SW wind 6 to 8 kt becoming S in the afternoon. Showers likely, with thunderstorms also possible after 5pm. Seas 1 ft or less.

Tuesday Night

S wind 6 to 8 kt becoming E after midnight. Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Seas 1 ft or less.

Wednesday

ENE wind 6 to 9 kt becoming ESE in the afternoon. A chance of showers between 8am and 2pm. Seas 1 ft or less.

Wednesday Night

ESE wind 5 to 7 kt becoming S after midnight. A chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Seas 1 ft or less.

Thursday

WSW wind 6 to 8 kt becoming S in the afternoon. A chance of showers, with thunderstorms also possible after 2pm. 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.