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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Tonight
SSW 8kt
< 1ft
Thursday
⇑SE 7kt
< 1ft
Thursday Night
E 6kt
< 1ft
Friday
NE 9kt
< 1ft
Friday Night
NE 8kt
< 1ft
Saturday
ENE 10kt
< 1ft
Saturday Night
ESE 7kt⇓
< 1ft
Sunday
SSW 9kt
< 1ft
Sunday Night
SW 8kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 2:29 pm EDT Aug 19, 2026
Forecast Valid: 10pm EDT Aug 19, 2026-6pm EDT Aug 26, 2026

View Nearby Observations

Detailed Forecast

Tonight

SSW wind 5 to 8 kt becoming WSW after midnight. Mostly clear. Seas 1 ft or less.

Thursday

Variable winds less than 5 kt becoming SE 5 to 7 kt in the afternoon. A slight chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Seas 1 ft or less.

Thursday Night

E wind around 6 kt becoming SE in the evening. Showers likely and possibly a thunderstorm. Seas 1 ft or less.

Friday

NNE wind around 9 kt becoming ENE in the afternoon. A chance of showers. Seas 1 ft or less.

Friday Night

NE wind around 8 kt. A chance of showers. Seas 1 ft or less.

Saturday

NE wind around 10 kt becoming ESE in the afternoon. A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Seas 1 ft or less.

Saturday Night

ESE wind 5 to 7 kt becoming variable and less than 5 kt after midnight. Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Seas 1 ft or less.

Sunday

E wind 5 to 9 kt becoming SSW in the morning. A chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Sunday Night

SW wind 6 to 8 kt becoming WNW after midnight. A chance of showers and thunderstorms before 8pm. 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.