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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Today
⇑SSW 15kt
< 1ft
Tonight
SSW 15kt
< 1ft
Sunday
NW 11kt
< 1ft
Sunday Night
N 7kt
< 1ft
Monday
⇑S 8kt
< 1ft
Monday Night
S 10kt
< 1ft
Tuesday
SSE 15kt
< 1ft
Tuesday Night
SW 15kt
< 1ft
Wednesday
SW 12kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 5:15 am EDT Jul 18, 2026
Forecast Valid: 7am EDT Jul 18, 2026-6pm EDT Jul 24, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT FROM NOON EDT TODAY THROUGH

Today

SSW wind 9 to 12 kt increasing to 12 to 15 kt in the afternoon. Winds could gust as high as 23 kt. A slight chance of showers, then showers and possibly a thunderstorm after 11am. Some of the storms could be severe. Areas of smoke. Seas 1 ft or less.

Tonight

SSW wind 13 to 15 kt becoming W after midnight. Winds could gust as high as 23 kt. Showers and possibly a thunderstorm before 11pm, then a chance of showers and thunderstorms between 11pm and 2am. Some of the storms could be severe. Seas 1 ft or less.

Sunday

NW wind 9 to 11 kt. Sunny. Seas 1 ft or less.

Sunday Night

N wind around 7 kt. Mostly clear. Seas 1 ft or less.

Monday

Variable winds less than 5 kt becoming S 5 to 8 kt in the afternoon. Sunny. Seas 1 ft or less.

Monday Night

S wind around 10 kt. Increasing clouds. Seas 1 ft or less.

Tuesday

SSE wind 11 to 15 kt. A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Seas 1 ft or less.

Tuesday Night

S wind 13 to 15 kt becoming SW after midnight. Winds could gust as high as 23 kt. Showers and possibly a thunderstorm. Seas 1 ft or less.

Wednesday

SW wind around 12 kt. Showers likely, with thunderstorms also possible after 2pm. 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.