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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

    • Overnight

      Overnight:W wind around 6 kt. Showers likely and possibly a thunderstorm before 2am, then a slight chance of showers between 2am and 5am. Seas 1 ft or less.

      W 6kt
      < 1ft

    • Sunday

      Sunday:Variable winds less than 5 kt becoming SSE 5 to 7 kt in the morning. A chance of showers and thunderstorms, mainly after 2pm. Seas 1 ft or less.

      ⇑SSE 7kt
      < 1ft

    • Sunday Night

      Sunday Night:E wind around 9 kt. A chance of showers and thunderstorms, then rain and possibly a thunderstorm after 8pm. Seas 1 ft or less.

      E 9kt
      < 1ft

    • Monday

      Monday:E wind 13 to 15 kt. Rain and possibly a thunderstorm. Seas 1 ft or less.

      E 15kt
      < 1ft

    • Monday Night

      Monday Night:E wind 12 to 16 kt. Rain and possibly a thunderstorm. Seas 1 ft or less.

      E 16kt
      < 1ft

    • Tuesday

      Tuesday:NE wind around 14 kt. Showers likely and possibly a thunderstorm before 11am, then showers likely between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

      NE 14kt
      < 1ft

    • Tuesday Night

      Tuesday Night:NNE wind 8 to 10 kt. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.

      NNE 10kt
      < 1ft

    • Wednesday

      Wednesday:N wind 6 to 8 kt becoming WSW in the afternoon. Mostly sunny. Seas 1 ft or less.

      N 8kt
      < 1ft

    • Wednesday Night

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

      Light Wind
      < 1ft


Associated Zone Forecast which includes this point

Last Update: 5:30 pm EDT Jul 4, 2026
Forecast Valid: 12am EDT Jul 5, 2026-6pm EDT Jul 11, 2026

View Nearby Observations

Detailed Forecast


Overnight
W wind around 6 kt. Showers likely and possibly a thunderstorm before 2am, then a slight chance of showers between 2am and 5am. Seas 1 ft or less.
Sunday
Variable winds less than 5 kt becoming SSE 5 to 7 kt in the morning. A chance of showers and thunderstorms, mainly after 2pm. Seas 1 ft or less.
Sunday Night
E wind around 9 kt. A chance of showers and thunderstorms, then rain and possibly a thunderstorm after 8pm. Seas 1 ft or less.
Monday
E wind 13 to 15 kt. Rain and possibly a thunderstorm. Seas 1 ft or less.
Monday Night
E wind 12 to 16 kt. Rain and possibly a thunderstorm. Seas 1 ft or less.
Tuesday
NE wind around 14 kt. Showers likely and possibly a thunderstorm before 11am, then showers likely between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Seas 1 ft or less.
Tuesday Night
NNE wind 8 to 10 kt. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.
Wednesday
N wind 6 to 8 kt becoming WSW in the afternoon. Mostly sunny. Seas 1 ft or less.
Wednesday Night
Variable winds 5 kt or less. Mostly clear. 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: 5:30 pm EDT Jul 4, 2026
Forecast Valid: 12am EDT Jul 5, 2026-6pm EDT Jul 11, 2026
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