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

24°F

-4°C

Humidity 50%
Wind Speed W 7 mph
Barometer 29.91 in (1013.0 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 3 Jan 5:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Increasing clouds, with a high near 30. Wind chill values between 10 and 20. West wind 6 to 8 mph.

    High: 30 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Light snow likely, mainly between 1am and 4am. Cloudy, with a low around 23. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 23 °F

    Cloudy then
    Light Snow
    Likely

  • Sunday

    Sunday: A 30 percent chance of light snow before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 33. Wind chill values between 25 and 30. Calm wind becoming northwest 5 to 9 mph in the morning.

    High: 33 °F

    Chance Light
    Snow then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 17. Northwest wind around 6 mph.

    Low: 17 °F

    Partly Cloudy

  • Monday

    Monday: Increasing clouds, with a high near 33. Light and variable wind becoming west around 6 mph.

    High: 33 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Cloudy, with a temperature rising to around 31 by 3am.

    Low: 28 °F⇑

    Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 30. Wind chill values between 10 and 20. West wind 6 to 8 mph.
Tonight
Light snow likely, mainly between 1am and 4am. Cloudy, with a low around 23. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday
A 30 percent chance of light snow before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 33. Wind chill values between 25 and 30. Calm wind becoming northwest 5 to 9 mph in the morning.
Sunday Night
Partly cloudy, with a low around 17. Northwest wind around 6 mph.
Monday
Increasing clouds, with a high near 33. Light and variable wind becoming west around 6 mph.
Monday Night
Cloudy, with a temperature rising to around 31 by 3am.
Tuesday
Mostly cloudy, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 45.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Mostly sunny, with a high near 45.
Thursday Night
Mostly cloudy, with a low around 35.
Friday
A 30 percent chance of rain. Cloudy, with a high near 49.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
12:47 am EST Jan 3, 2026
Forecast Valid:
6am EST Jan 3, 2026-6pm EST Jan 9, 2026
 
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Additional Resources

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Chance of Precipitation