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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Today
ESE 7kt
< 1ft
Tonight
E 8kt
< 1ft
Sunday
SSW 11kt
< 1ft
Sunday Night
SW 10kt
< 1ft
Monday
SW 11kt
< 1ft
Monday Night
W 11kt
< 1ft
Tuesday
W 11kt
< 1ft
Tuesday Night
W 7kt
< 1ft
Wednesday
⇑SSW 8kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 3:42 am EDT Aug 22, 2026
Forecast Valid: 11am EDT Aug 22, 2026-6pm EDT Aug 28, 2026

View Nearby Observations

Detailed Forecast

Today

ESE wind around 7 kt. A slight chance of showers after 2pm. Seas 1 ft or less.

Tonight

E wind around 8 kt. A chance of showers before 11pm, then showers likely and possibly a thunderstorm between 11pm and 5am, then a chance of showers and thunderstorms after 5am. Patchy fog after 2am. Seas 1 ft or less.

Sunday

S wind 6 to 11 kt becoming SW in the morning. A chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then a chance of showers after 5pm. Patchy fog before 9am. Seas 1 ft or less.

Sunday Night

SW wind around 10 kt becoming W after midnight. A slight chance of showers before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am. Seas 1 ft or less.

Monday

SW wind 8 to 11 kt. A slight chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Monday Night

W wind 9 to 11 kt. Mostly clear. Seas 1 ft or less.

Tuesday

W wind around 11 kt. Sunny. Seas 1 ft or less.

Tuesday Night

W wind 5 to 7 kt. Mostly clear. Seas 1 ft or less.

Wednesday

Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. 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.