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New York, NY Local Forecast Office

18NM WSW Islip NY

Marine Point Forecast

[NOTICE]

This Afternoon
S 7kt
< 1ft
Tonight
NE 10kt
< 1ft
Wednesday
E 12kt
< 1ft
Wednesday Night
E 11kt
< 1ft
Thursday
SW 10kt
< 1ft
Thursday Night
WSW 8kt
< 1ft
Friday
NW 8kt
< 1ft
Friday Night
NNW 6kt
< 1ft
Saturday
N 8kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 2:22 pm EDT Sep 1, 2026
Forecast Valid: 3pm EDT Sep 1, 2026-6pm EDT Sep 8, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

S wind around 7 kt. A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 5pm. Seas 1 ft or less.

Tonight

E wind 5 to 10 kt becoming NNE in the evening. Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm. Seas 1 ft or less.

Wednesday

NE wind around 12 kt becoming E in the afternoon. A slight chance of showers after 2pm. Seas 1 ft or less.

Wednesday Night

E wind 6 to 11 kt becoming SE after midnight. A chance of showers and thunderstorms between 2am and 5am, then showers likely and possibly a thunderstorm after 5am. Seas 1 ft or less.

Thursday

SW wind 7 to 10 kt. Showers likely and possibly a thunderstorm before 2pm, then showers likely between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Seas 1 ft or less.

Thursday Night

WSW wind around 8 kt becoming W after midnight. Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Seas 1 ft or less.

Friday

NW wind around 8 kt. Mostly sunny. Seas 1 ft or less.

Friday Night

NNW wind around 6 kt. Partly cloudy. Seas 1 ft or less.

Saturday

N wind around 8 kt. 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.