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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

This Afternoon
W 11kt
< 1ft
Tonight
NW 11kt⇓
< 1ft
Thursday
⇑SW 12kt
< 1ft
Thursday Night
NNW 11kt
< 1ft
Friday
⇑SSW 9kt
< 1ft
Friday Night
S 9kt
< 1ft
Saturday
⇑S 15kt
< 1ft
Saturday Night
S 14kt
< 1ft
Sunday
WNW 11kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 2:20 pm EDT Jul 15, 2026
Forecast Valid: 3pm EDT Jul 15, 2026-6pm EDT Jul 22, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

W wind around 11 kt. A slight chance of thunderstorms after 5pm. Patchy smoke after 5pm. Seas 1 ft or less.

Tonight

NW wind 6 to 11 kt becoming variable and less than 5 kt after midnight. A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Widespread smoke, mainly between 8pm and midnight. Seas 1 ft or less.

Thursday

W wind 6 to 9 kt becoming SW 9 to 12 kt in the afternoon. Patchy smoke. Seas 1 ft or less.

Thursday Night

NNW wind 6 to 11 kt. Widespread smoke, mainly after 1am. Seas 1 ft or less.

Friday

Variable winds less than 5 kt becoming SSW 5 to 9 kt in the afternoon. Mostly sunny. Seas 1 ft or less.

Friday Night

S wind 7 to 9 kt. Mostly cloudy. Seas 1 ft or less.

Saturday

S wind 6 to 9 kt increasing to 12 to 15 kt in the afternoon. A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Seas 1 ft or less.

Saturday Night

S wind 12 to 14 kt becoming SW after midnight. Winds could gust as high as 20 kt. Showers and possibly a thunderstorm before 2am, then showers likely. Seas 1 ft or less.

Sunday

WNW wind 9 to 11 kt. Showers likely. 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.