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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]
    • Tonight

      Tonight:SW wind 15 to 20 kt, with gusts as high as 27 kt. A slight chance of showers and thunderstorms after 11pm.   Seas around 4 ft.

      SW 20kt
      4ft

      Small Craft Advisory
      Small Craft Advisory

    • Wednesday

      Wednesday:SSW wind 14 to 17 kt increasing to 18 to 21 kt in the afternoon. Sunny. Seas 3 to 4 ft.

      ⇑SSW 21kt
      3-4ft

    • Wednesday Night

      Wednesday Night:SSW wind 21 to 24 kt decreasing to 17 to 20 kt after midnight. Winds could gust as high as 30 kt. A chance of showers and thunderstorms, mainly after 11pm.   Seas 6 ft subsiding to 4 ft.

      SSW 24kt⇓
      6ftWaves Subsiding

    • Thursday

      Thursday:SSW wind 12 to 16 kt, with gusts as high as 22 kt. Partly sunny through mid morning, then becoming sunny. Seas around 3 ft.

      SSW 16kt
      3ft

    • Thursday Night

      Thursday Night:SSW wind 16 to 19 kt decreasing to 12 to 15 kt after midnight. Mostly clear. Seas 3 to 4 ft.

      SSW 19kt⇓
      3-4ft

    • Friday

      Friday:W wind 8 to 11 kt becoming SSW 12 to 15 kt in the afternoon. Sunny. Seas 2 to 3 ft.

      ⇑SSW 15kt
      2-3ft

    • Friday Night

      Friday Night:SW wind 6 to 10 kt becoming WNW after midnight. Partly cloudy. Seas 2 to 3 ft.

      SW 10kt
      2-3ft

    • Independence Day

      Independence Day:Variable winds less than 5 kt becoming SSW 8 to 13 kt in the morning. A chance of showers and thunderstorms after 2pm.   Seas around 2 ft.

      ⇑SSW 13kt
      2ft

    • Saturday Night

      Saturday Night:WSW wind 5 to 9 kt. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am.   Seas around 2 ft.

      WSW 9kt
      2ft


Associated Zone Forecast which includes this point

Last Update: 2:25 pm EDT Jun 30, 2026
Forecast Valid: 7pm EDT Jun 30, 2026-6pm EDT Jul 7, 2026

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Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

Tonight
SW wind 15 to 20 kt, with gusts as high as 27 kt. A slight chance of showers and thunderstorms after 11pm. Seas around 4 ft.
Wednesday
SSW wind 14 to 17 kt increasing to 18 to 21 kt in the afternoon. Sunny. Seas 3 to 4 ft.
Wednesday Night
SSW wind 21 to 24 kt decreasing to 17 to 20 kt after midnight. Winds could gust as high as 30 kt. A chance of showers and thunderstorms, mainly after 11pm. Seas 6 ft subsiding to 4 ft.
Thursday
SSW wind 12 to 16 kt, with gusts as high as 22 kt. Partly sunny through mid morning, then becoming sunny. Seas around 3 ft.
Thursday Night
SSW wind 16 to 19 kt decreasing to 12 to 15 kt after midnight. Mostly clear. Seas 3 to 4 ft.
Friday
W wind 8 to 11 kt becoming SSW 12 to 15 kt in the afternoon. Sunny. Seas 2 to 3 ft.
Friday Night
SW wind 6 to 10 kt becoming WNW after midnight. Partly cloudy. Seas 2 to 3 ft.
Independence Day
Variable winds less than 5 kt becoming SSW 8 to 13 kt in the morning. A chance of showers and thunderstorms after 2pm. Seas around 2 ft.
Saturday Night
WSW wind 5 to 9 kt. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Seas around 2 ft.

Winds and seas may be higher in and near tstms.

*Notices:

  1. 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.
  2. 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.
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ABOUT THIS FORECAST

Point Forecast: 40.53°N 73.44°W
Last Update: 2:25 pm EDT Jun 30, 2026
Forecast Valid: 7pm EDT Jun 30, 2026-6pm EDT Jul 7, 2026
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