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.

Partly Cloudy

23°F

-5°C

Humidity 44%
Wind Speed NE 7 mph
Barometer 30.33 in (1027.1 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 5 Dec 8:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Increasing clouds, with a high near 36. Wind chill values between 20 and 30. East wind 5 to 7 mph.

    High: 36 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A chance of snow after 10pm, mixing with freezing rain after 4am. Mostly cloudy, with a low around 29. Calm wind. Chance of precipitation is 30%.

    Low: 29 °F

    Slight Chance
    Light Snow
    then Chance
    Wintry Mix

  • Saturday

    Saturday: A chance of snow and freezing rain before 8am, then a slight chance of rain between 8am and 10am. Mostly cloudy, with a high near 45. Light and variable wind becoming west 5 to 10 mph in the morning. Chance of precipitation is 30%.

    High: 45 °F

    Chance Wintry
    Mix then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30. Northwest wind 6 to 8 mph.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 43. North wind around 7 mph becoming south in the afternoon.

    High: 43 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers before 1am. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Chance Snow
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 36. Breezy.

    High: 36 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 36. Wind chill values between 20 and 30. East wind 5 to 7 mph.
Tonight
A chance of snow after 10pm, mixing with freezing rain after 4am. Mostly cloudy, with a low around 29. Calm wind. Chance of precipitation is 30%.
Saturday
A chance of snow and freezing rain before 8am, then a slight chance of rain between 8am and 10am. Mostly cloudy, with a high near 45. Light and variable wind becoming west 5 to 10 mph in the morning. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 30. Northwest wind 6 to 8 mph.
Sunday
Increasing clouds, with a high near 43. North wind around 7 mph becoming south in the afternoon.
Sunday Night
A 30 percent chance of snow showers before 1am. Mostly cloudy, with a low around 25.
Monday
Mostly sunny, with a high near 36. Breezy.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Partly sunny, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 50.
Wednesday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
6:53 am EST Dec 5, 2025
Forecast Valid:
9am EST Dec 5, 2025-6pm EST Dec 11, 2025
 
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Additional Resources

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Chance of Precipitation