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Hazardous Weather Conditions

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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

    • Late Afternoon

      Late Afternoon:S wind around 15 kt, with gusts as high as 21 kt. A slight chance of showers. Seas 1 ft or less.

      S 15kt
      < 1ft

    • Tonight

      Tonight:SSE wind 15 to 19 kt, with gusts as high as 26 kt. Showers, with thunderstorms also possible after 2am. Seas 1 ft or less.

      SSE 19kt
      < 1ft

    • Monday

      Monday:S wind 9 to 12 kt becoming W 6 to 9 kt in the afternoon. Showers likely and possibly a thunderstorm before 11am. Seas 1 ft or less.

      S 12kt⇓
      < 1ft

    • Monday Night

      Monday Night:Variable winds 5 kt or less. A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Seas 1 ft or less.

      Light Wind
      < 1ft

    • Tuesday

      Tuesday:N wind 5 to 8 kt becoming variable and less than 5 kt. Sunny. Seas 1 ft or less.

      N 8kt⇓
      < 1ft

    • Tuesday Night

      Tuesday Night:Variable winds 5 kt or less. Mostly clear. Seas 1 ft or less.

      Light Wind
      < 1ft

    • Wednesday

      Wednesday:Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. Sunny. Seas 1 ft or less.

      ⇑SSW 8kt
      < 1ft

    • Wednesday Night

      Wednesday Night:SSW wind 5 to 8 kt becoming WNW after midnight. Partly cloudy. Seas 1 ft or less.

      SSW 8kt
      < 1ft

    • Thursday

      Thursday:N wind 5 to 7 kt becoming SSW in the afternoon. A chance of showers and thunderstorms after 8am. Seas 1 ft or less.

      SSW 7kt
      < 1ft


Associated Zone Forecast which includes this point

Last Update: 2:20 pm EDT Aug 16, 2026
Forecast Valid: 5pm EDT Aug 16, 2026-6pm EDT Aug 23, 2026

View Nearby Observations

Detailed Forecast

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

Late Afternoon
S wind around 15 kt, with gusts as high as 21 kt. A slight chance of showers. Seas 1 ft or less.
Tonight
SSE wind 15 to 19 kt, with gusts as high as 26 kt. Showers, with thunderstorms also possible after 2am. Seas 1 ft or less.
Monday
S wind 9 to 12 kt becoming W 6 to 9 kt in the afternoon. Showers likely and possibly a thunderstorm before 11am. Seas 1 ft or less.
Monday Night
Variable winds 5 kt or less. A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Seas 1 ft or less.
Tuesday
N wind 5 to 8 kt becoming variable and less than 5 kt. Sunny. Seas 1 ft or less.
Tuesday Night
Variable winds 5 kt or less. Mostly clear. Seas 1 ft or less.
Wednesday
Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. Sunny. Seas 1 ft or less.
Wednesday Night
SSW wind 5 to 8 kt becoming WNW after midnight. Partly cloudy. Seas 1 ft or less.
Thursday
N wind 5 to 7 kt becoming SSW in the afternoon. A chance of showers and thunderstorms after 8am. 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: 2:20 pm EDT Aug 16, 2026
Forecast Valid: 5pm EDT Aug 16, 2026-6pm EDT Aug 23, 2026
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