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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

    • Thursday

      Thursday:Variable winds less than 5 kt becoming SW 8 to 13 kt in the morning. A slight chance of showers and thunderstorms after 5pm. Areas of smoke. Seas 1 ft or less.

      ⇑SW 13kt
      < 1ft

    • Thursday Night

      Thursday Night:NNW wind 8 to 11 kt decreasing to 5 to 8 kt after midnight. A slight chance of showers and thunderstorms before 8pm. Widespread smoke, mainly after 1am. Seas 1 ft or less.

      NNW 11kt⇓
      < 1ft

    • Friday

      Friday:Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. Mostly sunny. Seas 1 ft or less.

      ⇑SSW 8kt
      < 1ft

    • Friday Night

      Friday Night:SSW wind around 9 kt. Partly cloudy. Seas 1 ft or less.

      SSW 9kt
      < 1ft

    • Saturday

      Saturday:SSW wind 7 to 10 kt increasing to 12 to 15 kt in the afternoon. Showers, with thunderstorms also possible after 5pm. Seas 1 ft or less.

      ⇑SSW 15kt
      < 1ft

    • Saturday Night

      Saturday Night:S wind 14 to 16 kt becoming WSW after midnight. Showers before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Seas 1 ft or less.

      S 16kt
      < 1ft

    • Sunday

      Sunday:WNW wind 9 to 11 kt. A chance of showers before 8am. Seas 1 ft or less.

      WNW 11kt
      < 1ft

    • Sunday Night

      Sunday Night:NNW wind around 6 kt. Mostly clear. Seas 1 ft or less.

      NNW 6kt
      < 1ft

    • Monday

      Monday:NNE wind 5 to 8 kt becoming S in the afternoon. Sunny. Seas 1 ft or less.

      S 8kt
      < 1ft


Associated Zone Forecast which includes this point

Last Update: 2:48 am EDT Jul 16, 2026
Forecast Valid: 3am EDT Jul 16, 2026-6pm EDT Jul 22, 2026

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Detailed Forecast


Thursday
Variable winds less than 5 kt becoming SW 8 to 13 kt in the morning. A slight chance of showers and thunderstorms after 5pm. Areas of smoke. Seas 1 ft or less.
Thursday Night
NNW wind 8 to 11 kt decreasing to 5 to 8 kt after midnight. A slight chance of showers and thunderstorms before 8pm. Widespread smoke, mainly after 1am. Seas 1 ft or less.
Friday
Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. Mostly sunny. Seas 1 ft or less.
Friday Night
SSW wind around 9 kt. Partly cloudy. Seas 1 ft or less.
Saturday
SSW wind 7 to 10 kt increasing to 12 to 15 kt in the afternoon. Showers, with thunderstorms also possible after 5pm. Seas 1 ft or less.
Saturday Night
S wind 14 to 16 kt becoming WSW after midnight. Showers before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Seas 1 ft or less.
Sunday
WNW wind 9 to 11 kt. A chance of showers before 8am. Seas 1 ft or less.
Sunday Night
NNW wind around 6 kt. Mostly clear. Seas 1 ft or less.
Monday
NNE wind 5 to 8 kt becoming S in the afternoon. Sunny. 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: 2:48 am EDT Jul 16, 2026
Forecast Valid: 3am EDT Jul 16, 2026-6pm EDT Jul 22, 2026
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