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18NM WSW Islip NY

[NOTICE]

Last Update: 1:22 pm EDT Sep 13, 2026
Forecast Valid: 1pm EDT Sep 13, 2026-6pm EDT Sep 19, 2026

This Afternoon

W wind around 8 kt. A chance of showers and thunderstorms before 2pm. Some of the storms could produce heavy rainfall. Seas 1 ft or less.

Tonight

SSW wind 6 to 9 kt becoming W after midnight. A slight chance of showers after 5am. Seas 1 ft or less.

Monday

NNW wind around 12 kt. A slight chance of showers before 8am. Seas 1 ft or less.

Monday Night

NNE wind 10 to 12 kt. Mostly clear. Seas 1 ft or less.

Tuesday

NE wind 7 to 9 kt becoming ESE in the afternoon. Sunny. Seas 1 ft or less.

Tuesday Night

SE wind 5 to 7 kt becoming S after midnight. Partly cloudy. Seas 1 ft or less.

Wednesday

Variable winds less than 5 kt becoming S 5 to 8 kt in the morning. Sunny. Seas 1 ft or less.

Wednesday Night

S wind 5 to 7 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas 1 ft or less.

Thursday

Variable winds less than 5 kt becoming S 5 to 9 kt in the afternoon. Mostly sunny. Seas 1 ft or less.

Winds and seas may be higher in and near tstms.

*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.