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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

Memorial Day
⇑SW 6kt
< 1ft
Tonight
Light Wind
< 1ft
Tuesday
⇑SSW 7kt
< 1ft
Tuesday Night
SW 8kt
< 1ft
Wednesday
SW 10kt
< 1ft
Wednesday Night
WSW 9kt
< 1ft
Thursday
NNW 9kt
< 1ft
Thursday Night
N 7kt
< 1ft
Friday
⇑SSW 10kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 5:55 am EDT May 25, 2026
Forecast Valid: 8am EDT May 25, 2026-6pm EDT May 31, 2026

View Nearby Observations

Detailed Forecast

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING...

Memorial Day

Variable winds less than 5 kt becoming SW around 6 kt in the morning. Showers and possibly a thunderstorm before 11am, then a chance of showers between 11am and 1pm. Seas 1 ft or less.

Tonight

Variable winds 5 kt or less. Mostly cloudy. Seas 1 ft or less.

Tuesday

Variable winds less than 5 kt becoming SSW 5 to 7 kt in the afternoon. Partly sunny. Seas 1 ft or less.

Tuesday Night

SW wind around 8 kt. Mostly cloudy. Seas 1 ft or less.

Wednesday

SW wind 6 to 10 kt. Partly sunny. Seas 1 ft or less.

Wednesday Night

WSW wind around 9 kt becoming NNW after midnight. Mostly cloudy. Seas 1 ft or less.

Thursday

NNW wind around 9 kt. Sunny. Seas 1 ft or less.

Thursday Night

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

Friday

Variable winds less than 5 kt becoming SSW 5 to 10 kt in the morning. Mostly sunny. 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.