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.

Fair

N/A

Humidity NA
Wind Speed W 9 mph
Barometer 29.77 in
Dewpoint N/A
Visibility 10.00 mi
Last update 31 Dec 2:26 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Partly sunny, with a high near 34. Wind chill values between 10 and 20. West wind 9 to 16 mph.

    High: 34 °F

    Partly Sunny

  • Tonight

    Tonight: Light snow, mainly between 1am and 4am. Steady temperature around 29. Wind chill values between 15 and 20. Southwest wind 10 to 13 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Chance Light
    Snow then
    Light Snow

  • New Year's Day

    New Year's Day: A 20 percent chance of snow showers before 10am. Mostly sunny, with a temperature rising to near 31 by 10am, then falling to around 24 during the remainder of the day. Wind chill values between 10 and 20. Blustery, with a northwest wind 15 to 24 mph, with gusts as high as 34 mph.

    High: 31 °F⇓

    Blustery.
    Slight Chance
    Snow Showers
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 17. Wind chill values between 5 and 10. West wind 9 to 13 mph.

    Low: 17 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 32. West wind 9 to 16 mph.

    High: 32 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 32.

    High: 32 °F

    Increasing
    Clouds

  • Saturday Night

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

    Low: 20 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 34. Wind chill values between 10 and 20. West wind 9 to 16 mph.
Tonight
Light snow, mainly between 1am and 4am. Steady temperature around 29. Wind chill values between 15 and 20. Southwest wind 10 to 13 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
New Year's Day
A 20 percent chance of snow showers before 10am. Mostly sunny, with a temperature rising to near 31 by 10am, then falling to around 24 during the remainder of the day. Wind chill values between 10 and 20. Blustery, with a northwest wind 15 to 24 mph, with gusts as high as 34 mph.
Thursday Night
Mostly clear, with a low around 17. Wind chill values between 5 and 10. West wind 9 to 13 mph.
Friday
Partly sunny, with a high near 32. West wind 9 to 16 mph.
Friday Night
Mostly clear, with a low around 22.
Saturday
Increasing clouds, with a high near 32.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 32.
Sunday Night
Partly cloudy, with a low around 20.
Monday
Partly sunny, with a high near 37.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 39.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:27 am EST Dec 31, 2025
Forecast Valid:
4am EST Dec 31, 2025-6pm EST Jan 6, 2026
 
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