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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Today
S 12kt
< 1ft
Tonight
SSW 10kt
< 1ft
Thursday
S 14kt
< 1ft
Thursday Night
SSW 14kt⇓
< 1ft
Friday
SSW 7kt
< 1ft
Friday Night
NW 6kt
< 1ft
Saturday
W 11kt
< 1ft
Saturday Night
W 11kt
< 1ft
Sunday
WNW 11kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 7:41 am EST Nov 4, 2026
Forecast Valid: 11am EST Nov 4, 2026-6pm EST Nov 10, 2026

View Nearby Observations

Detailed Forecast

Today

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

Tonight

SSW wind 7 to 10 kt. Partly cloudy. Seas 1 ft or less.

Thursday

S wind 10 to 14 kt. Mostly cloudy. Seas 1 ft or less.

Thursday Night

SSW wind 11 to 14 kt decreasing to 8 to 11 kt after midnight. A chance of showers, then showers and possibly a thunderstorm after 1am. Seas 1 ft or less.

Friday

SSW wind around 7 kt. Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Seas 1 ft or less.

Friday Night

S wind around 6 kt becoming NW in the evening. Showers, mainly before midnight. The rain could be heavy at times. Seas 1 ft or less.

Saturday

NW wind 7 to 11 kt becoming W in the afternoon. Mostly sunny. Seas 1 ft or less.

Saturday Night

W wind around 11 kt. Partly cloudy. Seas 1 ft or less.

Sunday

WNW wind around 11 kt. Mostly sunny. Seas 1 ft or less.

*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.