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Islip, NY Marine Weather Forecast

Overnight - 21°F
Dec 28, 2025
6 mph NW
Mostly Clear
Mostly clear, with a low around 21. Wind chill values as low as 13. Northwest wind around 6 mph.
Sunday - 40°F
Dec 28, 2025
8 mph W
Partly Sunny then Slight Chance Light Rain
A slight chance of rain after 4pm. Partly sunny. High near 40, with temperatures falling to around 34 in the afternoon. Wind chill values as low as 13. West wind around 8 mph. Chance of precipitation is 20%.
Sunday Night - 35°F
Dec 28, 2025
8 to 15 mph SW
Light Rain
Rain. Cloudy. Low around 35, with temperatures rising to around 43 overnight. Southwest wind 8 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Monday - 51°F
Dec 29, 2025
14 to 18 mph SW
Light Rain
Rain. Cloudy. High near 51, with temperatures falling to around 44 in the afternoon. Southwest wind 14 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Monday Night - 25°F
Dec 29, 2025
20 mph W
Light Rain Likely then Partly Cloudy
Rain likely before 7pm. Partly cloudy. Low around 25, with temperatures rising to around 28 overnight. West wind around 20 mph, with gusts as high as 37 mph. Chance of precipitation is 70%.
Tuesday - 34°F
Dec 30, 2025
21 mph W
Partly Sunny
Partly sunny. High near 34, with temperatures falling to around 31 in the afternoon.
Tuesday Night - 25°F
Dec 30, 2025
13 to 18 mph W
Mostly Cloudy
Mostly cloudy, with a low around 25.
Wednesday - 37°F
Dec 31, 2025
13 to 16 mph W
Partly Sunny
Partly sunny, with a high near 37.
Wednesday Night - 25°F
Dec 31, 2025
13 mph W
Mostly Cloudy then Slight Chance Light Snow
A slight chance of snow after 1am. Mostly cloudy, with a low around 25.
New Year's Day - 34°F
Jan 01, 2026
13 mph W
Chance Light Snow
A chance of snow. Partly sunny, with a high near 34. Chance of precipitation is 30%.
Thursday Night - 21°F
Jan 01, 2026
7 to 10 mph NW
Chance Light Snow
A chance of snow before 1am. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Friday - 32°F
Jan 02, 2026
8 to 12 mph NW
Mostly Sunny
Mostly sunny, with a high near 32.
Friday Night - 21°F
Jan 02, 2026
8 mph W
Partly Cloudy
Partly cloudy, with a low around 21.
Saturday - 38°F
Jan 03, 2026
7 to 12 mph W
Mostly Sunny
Mostly sunny, with a high near 38.

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