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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]

Today
SW 9kt
3-4ft
Tonight
NNW 10kt
2-3ft
Wednesday
NNW 10kt
2-3ft
Wednesday Night
SW 11kt⇓
2-3ft
Thursday
⇑S 10kt
2ft
Thursday Night
S 14kt
3-4ft
Friday
SSW 13kt
3ft
Friday Night
SSW 12kt⇓
2ft
Saturday
⇑S 7kt
2ft

Associated Zone Forecast which includes this point

Last Update: 7:07 am EDT Jun 23, 2026
Forecast Valid: 7am EDT Jun 23, 2026-6pm EDT Jun 29, 2026

View Nearby Observations

Detailed Forecast

Today

SW wind 6 to 9 kt becoming NNW in the afternoon. Rain and possibly a thunderstorm, mainly before 5pm, then showers and possibly a thunderstorm after 5pm. Some of the storms could produce heavy rainfall. Seas 3 to 4 ft.

Tonight

NNW wind around 10 kt. Showers and possibly a thunderstorm before 8pm, then showers likely between 8pm and 11pm. Seas 2 to 3 ft.

Wednesday

NNW wind 7 to 10 kt becoming WSW in the afternoon. Sunny. Seas 2 to 3 ft.

Wednesday Night

SW wind 6 to 11 kt becoming variable and less than 5 kt after midnight. Mostly clear. Seas 2 to 3 ft.

Thursday

Variable winds less than 5 kt becoming S 5 to 10 kt in the afternoon. Mostly sunny. Seas around 2 ft.

Thursday Night

S wind 12 to 14 kt, with gusts as high as 20 kt. A chance of showers after 2am. Seas 3 to 4 ft.

Friday

SSW wind 9 to 13 kt. A chance of showers. Seas around 3 ft.

Friday Night

SSW wind 9 to 12 kt decreasing to 6 to 9 kt after midnight. A chance of showers before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then showers likely after 2am. Seas around 2 ft.

Saturday

Variable winds less than 5 kt becoming S 5 to 7 kt in the afternoon. Showers likely, with thunderstorms also possible after 2pm. Seas around 2 ft.

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.