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New York, NY Local Forecast Office

15NM SW Islip NY

Marine Point Forecast

[NOTICE]
    • Late Afternoon

      Late Afternoon:NNE wind around 10 kt. Snow, possibly mixed with rain.   Seas around 3 ft.

      NNE 10kt
      3ft

    • Tonight

      Tonight:N wind 11 to 15 kt becoming WNW after midnight. Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending.   Seas 3 to 4 ft.

      NW 15kt
      3-4ft

    • M.L.King Day

      M.L.King Day:WSW wind 16 to 21 kt increasing to 21 to 26 kt in the afternoon. Mostly sunny. Seas 4 ft building to 6 ft.

      ⇑WSW 26kt
      Waves Building6ft

      Small Craft Advisory
      Small Craft Advisory

    • Monday Night

      Monday Night:W wind 25 to 29 kt. Partly cloudy. Seas 6 to 7 ft.

      W 29kt
      6-7ft

    • Tuesday

      Tuesday:W wind 22 to 26 kt. Sunny. Seas around 5 ft.

      W 26kt
      5ft

    • Tuesday Night

      Tuesday Night:W wind 19 to 22 kt decreasing to 14 to 17 kt after midnight. Mostly clear. Seas 5 ft subsiding to 3 ft.

      W 22kt⇓
      5ftWaves Subsiding

    • Wednesday

      Wednesday:W wind 10 to 15 kt becoming SSW 17 to 22 kt. Mostly sunny. Seas 2 ft building to 5 ft.

      ⇑SSW 22kt
      Waves Building5ft

    • Wednesday Night

      Wednesday Night:SW wind 23 to 26 kt decreasing to 20 to 23 kt after midnight. Mostly cloudy. Seas 5 to 6 ft.

      SW 26kt⇓
      5-6ft

    • Thursday

      Thursday:W wind 19 to 22 kt. Partly sunny. Seas around 5 ft.

      W 22kt
      5ft


Associated Zone Forecast which includes this point

Last Update: 10:00 am EST Jan 18, 2026
Forecast Valid: 5pm EST Jan 18, 2026-6pm EST Jan 25, 2026

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Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT FROM MONDAY MORNING THROUGH

Late Afternoon
NNE wind around 10 kt. Snow, possibly mixed with rain. Seas around 3 ft.
Tonight
N wind 11 to 15 kt becoming WNW after midnight. Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Seas 3 to 4 ft.
M.L.King Day
WSW wind 16 to 21 kt increasing to 21 to 26 kt in the afternoon. Mostly sunny. Seas 4 ft building to 6 ft.
Monday Night
W wind 25 to 29 kt. Partly cloudy. Seas 6 to 7 ft.
Tuesday
W wind 22 to 26 kt. Sunny. Seas around 5 ft.
Tuesday Night
W wind 19 to 22 kt decreasing to 14 to 17 kt after midnight. Mostly clear. Seas 5 ft subsiding to 3 ft.
Wednesday
W wind 10 to 15 kt becoming SSW 17 to 22 kt. Mostly sunny. Seas 2 ft building to 5 ft.
Wednesday Night
SW wind 23 to 26 kt decreasing to 20 to 23 kt after midnight. Mostly cloudy. Seas 5 to 6 ft.
Thursday
W wind 19 to 22 kt. Partly sunny. Seas around 5 ft.

*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: 10:00 am EST Jan 18, 2026
Forecast Valid: 5pm EST Jan 18, 2026-6pm EST Jan 25, 2026
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