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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

29°F

-2°C

Humidity 39%
Wind Speed W 13 G 26 mph
Barometer 29.75 in (1007.4 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 30 Dec 9:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 9 to 11 mph, with gusts as high as 29 mph.

    Low: 24 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 34. Wind chill values between 15 and 25. West wind 9 to 11 mph, with gusts as high as 23 mph.

    High: 34 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Snow likely, mainly after 1am. Increasing clouds, with a low around 24. Southwest wind 7 to 9 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    Low: 24 °F

    Chance Snow
    then Snow
    Likely

  • New Year's Day

    New Year's Day: A 20 percent chance of snow before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 31. Wind chill values between 15 and 20. Northwest wind 10 to 14 mph, with gusts as high as 26 mph.

    High: 31 °F

    Slight Chance
    Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 17. West wind 6 to 9 mph, with gusts as high as 23 mph.

    Low: 17 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 34.

    High: 34 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 9 to 11 mph, with gusts as high as 29 mph.
Wednesday
Partly sunny, with a high near 34. Wind chill values between 15 and 25. West wind 9 to 11 mph, with gusts as high as 23 mph.
Wednesday Night
Snow likely, mainly after 1am. Increasing clouds, with a low around 24. Southwest wind 7 to 9 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
New Year's Day
A 20 percent chance of snow before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 31. Wind chill values between 15 and 20. Northwest wind 10 to 14 mph, with gusts as high as 26 mph.
Thursday Night
Partly cloudy, with a low around 17. West wind 6 to 9 mph, with gusts as high as 23 mph.
Friday
Partly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 32.
Saturday Night
Partly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 33.
Sunday Night
Mostly cloudy, with a low around 24.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Monday Night
A chance of rain and snow. Mostly cloudy, with a low around 26. Chance of precipitation is 30%.
Tuesday
Partly sunny, with a high near 36.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
7:32 pm EST Dec 30, 2025
Forecast Valid:
11pm EST Dec 30, 2025-6pm EST Jan 6, 2026
 
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Additional Resources

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Chance of Precipitation