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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

    • Tonight

      Tonight:SSW wind 5 to 9 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas 1 ft or less.

      SSW 9kt⇓
      < 1ft

    • Monday

      Monday:Variable winds less than 5 kt becoming SSE 6 to 11 kt in the morning. Mostly sunny. Seas 1 ft or less.

      ⇑SSE 11kt
      < 1ft

    • Monday Night

      Monday Night:S wind 8 to 12 kt becoming SSW after midnight. Partly cloudy. Seas 1 ft or less.

      S 12kt
      < 1ft

    • Tuesday

      Tuesday:SSW wind 9 to 12 kt increasing to 13 to 16 kt in the afternoon. Sunny. Seas 1 ft or less.

      ⇑SSW 16kt
      < 1ft

    • Tuesday Night

      Tuesday Night:SSW wind 12 to 17 kt. Partly cloudy. Seas 1 ft or less.

      SSW 17kt
      < 1ft

    • Wednesday

      Wednesday:SW wind 10 to 14 kt. Showers and possibly a thunderstorm after 2pm. Seas 1 ft or less.

      SW 14kt
      < 1ft

    • Wednesday Night

      Wednesday Night:W wind 6 to 9 kt becoming N after midnight. Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.

      NNW 9kt
      < 1ft

    • Thursday

      Thursday:N wind 5 to 8 kt becoming E in the afternoon. Partly sunny. Seas 1 ft or less.

      N 8kt
      < 1ft

    • Thursday Night

      Thursday Night:Variable winds 5 kt or less. Mostly cloudy. Seas 1 ft or less.

      Light Wind
      < 1ft


Associated Zone Forecast which includes this point

Last Update: 3:04 pm EDT May 17, 2026
Forecast Valid: 9pm EDT May 17, 2026-6pm EDT May 24, 2026

View Nearby Observations

Detailed Forecast


Tonight
SSW wind 5 to 9 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas 1 ft or less.
Monday
Variable winds less than 5 kt becoming SSE 6 to 11 kt in the morning. Mostly sunny. Seas 1 ft or less.
Monday Night
S wind 8 to 12 kt becoming SSW after midnight. Partly cloudy. Seas 1 ft or less.
Tuesday
SSW wind 9 to 12 kt increasing to 13 to 16 kt in the afternoon. Sunny. Seas 1 ft or less.
Tuesday Night
SSW wind 12 to 17 kt. Partly cloudy. Seas 1 ft or less.
Wednesday
SW wind 10 to 14 kt. Showers and possibly a thunderstorm after 2pm. Seas 1 ft or less.
Wednesday Night
W wind 6 to 9 kt becoming N after midnight. Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.
Thursday
N wind 5 to 8 kt becoming E in the afternoon. Partly sunny. Seas 1 ft or less.
Thursday Night
Variable winds 5 kt or less. Mostly cloudy. 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: 3:04 pm EDT May 17, 2026
Forecast Valid: 9pm EDT May 17, 2026-6pm EDT May 24, 2026
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