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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Today
N 10kt⇓
< 1ft
Tonight
S 10kt
< 1ft
Tuesday
N 9kt
< 1ft
Tuesday Night
SSW 12kt
< 1ft
Wednesday
⇑S 21kt
< 1ft
Wednesday Night
S 20kt
< 1ft
Thursday
SSW 11kt
< 1ft
Thursday Night
NW 7kt
< 1ft
Friday
NNW 8kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 5:59 am EDT May 11, 2026
Forecast Valid: 8am EDT May 11, 2026-6pm EDT May 17, 2026

View Nearby Observations

Detailed Forecast

Today

N wind 5 to 10 kt becoming variable and less than 5 kt. Mostly cloudy. Seas 1 ft or less.

Tonight

S wind 6 to 10 kt becoming N after midnight. Mostly cloudy, then gradually becoming mostly clear. Seas 1 ft or less.

Tuesday

N wind 5 to 9 kt becoming WSW in the afternoon. Sunny. Seas 1 ft or less.

Tuesday Night

SSW wind 10 to 12 kt. Increasing clouds. Seas 1 ft or less.

Wednesday

S wind 12 to 15 kt increasing to 18 to 21 kt in the afternoon. Winds could gust as high as 27 kt. A chance of showers, mainly after noon. Seas 1 ft or less.

Wednesday Night

S wind around 20 kt, with gusts as high as 26 kt. Showers, with thunderstorms also possible after 2am. Seas 1 ft or less.

Thursday

SSW wind 9 to 11 kt. Showers likely, mainly before noon. Seas 1 ft or less.

Thursday Night

NW wind around 7 kt. Mostly cloudy. Seas 1 ft or less.

Friday

NNW wind around 8 kt becoming WNW in the afternoon. A chance of showers. 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.