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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Late Afternoon
SSE 8kt
< 1ft
Tonight
SSE 6kt
< 1ft
Tuesday
S 8kt
< 1ft
Tuesday Night
ENE 8kt
< 1ft
Wednesday
E 10kt
< 1ft
Wednesday Night
E 10kt
< 1ft
Thursday
SW 10kt
< 1ft
Thursday Night
W 7kt
< 1ft
Friday
WNW 7kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 3:08 pm EDT Aug 31, 2026
Forecast Valid: 4pm EDT Aug 31, 2026-6pm EDT Sep 7, 2026

View Nearby Observations

Detailed Forecast

Late Afternoon

SSE wind around 8 kt. A chance of showers and thunderstorms after 5pm. Seas 1 ft or less.

Tonight

SSE wind around 6 kt becoming S after midnight. A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11pm. Patchy fog after 3am. Seas 1 ft or less.

Tuesday

SW wind 5 to 8 kt becoming S in the afternoon. A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Patchy fog before 9am. Seas 1 ft or less.

Tuesday Night

ENE wind around 8 kt. Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a slight chance of showers after 2am. Seas 1 ft or less.

Wednesday

E wind around 10 kt. A slight chance of showers before 2pm. Seas 1 ft or less.

Wednesday Night

E wind 6 to 10 kt becoming SSE after midnight. A chance of showers after 2am. Seas 1 ft or less.

Thursday

SW wind 8 to 10 kt. A chance of showers, with thunderstorms also possible after 2pm. Seas 1 ft or less.

Thursday Night

W wind around 7 kt becoming WNW after midnight. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.

Friday

WNW wind around 7 kt. Mostly sunny. 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.