National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

For More Weather Information:

New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

    • Tonight

      Tonight:S wind around 6 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas 1 ft or less.

      S 6kt⇓
      < 1ft

    • Wednesday

      Wednesday:Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. Partly sunny, then gradually becoming sunny. Seas 1 ft or less.

      ⇑SSW 8kt
      < 1ft

    • Wednesday Night

      Wednesday Night:SSW wind 6 to 8 kt becoming WSW after midnight. Partly cloudy. Seas 1 ft or less.

      SSW 8kt
      < 1ft

    • Thursday

      Thursday:Variable winds less than 5 kt becoming SW around 6 kt in the afternoon. A chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

      ⇑SW 6kt
      < 1ft

    • Thursday Night

      Thursday Night:Variable winds less than 5 kt becoming NNE around 6 kt after midnight. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.

      ⇑NNE 6kt
      < 1ft

    • Friday

      Friday:NNE wind around 8 kt becoming E in the afternoon. Mostly sunny. Seas 1 ft or less.

      NNE 8kt
      < 1ft

    • Friday Night

      Friday Night:Variable winds 5 kt or less. A chance of showers after 2am. Seas 1 ft or less.

      Light Wind
      < 1ft

    • Saturday

      Saturday:E wind 8 to 10 kt. A chance of showers. Seas 1 ft or less.

      E 10kt
      < 1ft

    • Saturday Night

      Saturday Night:E wind 5 to 8 kt. A chance of showers. Seas 1 ft or less.

      E 8kt
      < 1ft


Associated Zone Forecast which includes this point

Last Update: 2:34 pm EDT Aug 18, 2026
Forecast Valid: 8pm EDT Aug 18, 2026-6pm EDT Aug 25, 2026

View Nearby Observations

Detailed Forecast


Tonight
S wind around 6 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas 1 ft or less.
Wednesday
Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. Partly sunny, then gradually becoming sunny. Seas 1 ft or less.
Wednesday Night
SSW wind 6 to 8 kt becoming WSW after midnight. Partly cloudy. Seas 1 ft or less.
Thursday
Variable winds less than 5 kt becoming SW around 6 kt in the afternoon. A chance of showers and thunderstorms after 2pm. Seas 1 ft or less.
Thursday Night
Variable winds less than 5 kt becoming NNE around 6 kt after midnight. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.
Friday
NNE wind around 8 kt becoming E in the afternoon. Mostly sunny. Seas 1 ft or less.
Friday Night
Variable winds 5 kt or less. A chance of showers after 2am. Seas 1 ft or less.
Saturday
E wind 8 to 10 kt. A chance of showers. Seas 1 ft or less.
Saturday Night
E wind 5 to 8 kt. A chance of showers. 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.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

Point Forecast: 40.62°N 73.59°W
Last Update: 2:34 pm EDT Aug 18, 2026
Forecast Valid: 8pm EDT Aug 18, 2026-6pm EDT Aug 25, 2026
  Forecast Discussion
  Get as KML Get as XML

RADAR & SATELLITE IMAGES

 Link to Satellite Data