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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]
    • Tonight

      Tonight:SW wind 15 to 18 kt decreasing to 12 to 15 kt after midnight. Winds could gust as high as 25 kt. A slight chance of showers and thunderstorms after 11pm.   Seas 1 ft or less.

      SW 18kt⇓
      < 1ft

    • Wednesday

      Wednesday:SSW wind 11 to 16 kt. Sunny. Seas 1 ft or less.

      SSW 16kt
      < 1ft

    • Wednesday Night

      Wednesday Night:SSW wind 17 to 20 kt decreasing to 12 to 15 kt after midnight. A chance of showers and thunderstorms between 11pm and 2am, then a slight chance of showers.   Seas 1 ft or less.

      SSW 20kt⇓
      < 1ft

    • Thursday

      Thursday:SSW wind 9 to 14 kt. A slight chance of showers before 8am.   Seas 1 ft or less.

      SSW 14kt
      < 1ft

    • Thursday Night

      Thursday Night:WSW wind 12 to 15 kt decreasing to 9 to 12 kt after midnight. Mostly clear. Seas 1 ft or less.

      WSW 15kt⇓
      < 1ft

    • Friday

      Friday:W wind 7 to 12 kt becoming SW in the afternoon. Sunny. Seas 1 ft or less.

      SW 12kt
      < 1ft

    • Friday Night

      Friday Night:WSW wind around 6 kt becoming variable and less than 5 kt in the evening. Partly cloudy. Seas 1 ft or less.

      WSW 6kt⇓
      < 1ft

    • Independence Day

      Independence Day:Variable winds less than 5 kt becoming SSW 5 to 10 kt in the morning. A chance of showers and thunderstorms after 2pm.   Seas 1 ft or less.

      ⇑SSW 10kt
      < 1ft

    • Saturday Night

      Saturday Night:W wind around 6 kt becoming variable and less than 5 kt in the evening. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am.   Seas 1 ft or less.

      W 6kt⇓
      < 1ft


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 18 kt decreasing to 12 to 15 kt after midnight. Winds could gust as high as 25 kt. A slight chance of showers and thunderstorms after 11pm. Seas 1 ft or less.
Wednesday
SSW wind 11 to 16 kt. Sunny. Seas 1 ft or less.
Wednesday Night
SSW wind 17 to 20 kt decreasing to 12 to 15 kt after midnight. A chance of showers and thunderstorms between 11pm and 2am, then a slight chance of showers. Seas 1 ft or less.
Thursday
SSW wind 9 to 14 kt. A slight chance of showers before 8am. Seas 1 ft or less.
Thursday Night
WSW wind 12 to 15 kt decreasing to 9 to 12 kt after midnight. Mostly clear. Seas 1 ft or less.
Friday
W wind 7 to 12 kt becoming SW in the afternoon. Sunny. Seas 1 ft or less.
Friday Night
WSW wind around 6 kt becoming variable and less than 5 kt in the evening. Partly cloudy. Seas 1 ft or less.
Independence Day
Variable winds less than 5 kt becoming SSW 5 to 10 kt in the morning. A chance of showers and thunderstorms after 2pm. Seas 1 ft or less.
Saturday Night
W wind around 6 kt becoming variable and less than 5 kt in the evening. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.

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: 40.62°N 73.59°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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