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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Overnight
E 8kt
< 1ft
Sunday
S 11kt
< 1ft
Sunday Night
SW 10kt
< 1ft
Monday
W 12kt
< 1ft
Monday Night
W 10kt
< 1ft
Tuesday
W 11kt
< 1ft
Tuesday Night
W 7kt
< 1ft
Wednesday
⇑SSW 8kt
< 1ft
Wednesday Night
S 8kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 10:43 pm EDT Aug 22, 2026
Forecast Valid: 12am EDT Aug 23, 2026-6pm EDT Aug 29, 2026

View Nearby Observations

Detailed Forecast

Overnight

E wind around 8 kt. A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Seas 1 ft or less.

Sunday

ESE wind 7 to 11 kt becoming S in the afternoon. Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms, mainly between 8am and 5pm. Seas 1 ft or less.

Sunday Night

SW wind 8 to 10 kt becoming W after midnight. A slight chance of showers and thunderstorms before 8pm. Seas 1 ft or less.

Monday

W wind 7 to 12 kt. Sunny. Seas 1 ft or less.

Monday Night

W wind around 10 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.

Wednesday Night

S wind 5 to 8 kt. Partly cloudy. 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.