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15NM SW Islip NY

[NOTICE]

Last Update: 9:00 pm EDT May 20, 2026
Forecast Valid: 10pm EDT May 20, 2026-6pm EDT May 27, 2026

...SEVERE THUNDERSTORM WATCH 235 IN EFFECT UNTIL 9 PM EDT THIS

Tonight

NW wind 7 to 10 kt becoming N after midnight. Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Seas around 3 ft.

Thursday

NNE wind around 12 kt becoming E in the afternoon. Showers likely, mainly before 11am. Seas 2 to 3 ft.

Thursday Night

SE wind around 6 kt becoming variable and less than 5 kt. Cloudy during the early evening, then gradual clearing. Seas around 2 ft.

Friday

NE wind 13 to 16 kt becoming E in the afternoon. Increasing clouds. Seas 2 to 3 ft.

Friday Night

E wind around 11 kt. A chance of showers after 2am. Seas around 3 ft.

Saturday

E wind 16 to 19 kt increasing to 19 to 22 kt in the afternoon. Showers, mainly after 8am. Seas 3 ft building to 5 ft.

Saturday Night

E wind around 23 kt. Showers. Seas around 6 ft.

Sunday

E wind 16 to 19 kt decreasing to 11 to 14 kt in the afternoon. Showers likely. Seas around 6 ft.

Sunday Night

NE wind around 8 kt. A chance of showers. Seas around 6 ft.

*Notices:

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.
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.