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

27°F

-3°C

Humidity 45%
Wind Speed NW 13 G 20 mph
Barometer 29.81 in (1009.5 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 2 Jan 7:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Partly cloudy, with a low around 18. Wind chill values between 10 and 15. West wind around 9 mph.

    Low: 18 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 30. Wind chill values between 10 and 20. West wind 9 to 11 mph.

    High: 30 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A slight chance of snow showers between 10pm and 1am, then a chance of light snow after 1am. Cloudy, with a low around 22. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 22 °F

    Slight Chance
    Snow Showers
    then Chance
    Light Snow

  • Sunday

    Sunday: A 20 percent chance of light snow before 10am. Partly sunny, with a high near 34. Wind chill values between 20 and 25. Northwest wind 5 to 14 mph.

    High: 34 °F

    Slight Chance
    Light Snow
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18. Northwest wind 7 to 13 mph.

    Low: 18 °F

    Partly Cloudy

  • Monday

    Monday: Increasing clouds, with a high near 32.

    High: 32 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Cloudy, with a low around 23.

    Low: 23 °F

    Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 42.

    High: 42 °F

    Mostly Cloudy

  • Tuesday Night

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

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 18. Wind chill values between 10 and 15. West wind around 9 mph.
Saturday
Increasing clouds, with a high near 30. Wind chill values between 10 and 20. West wind 9 to 11 mph.
Saturday Night
A slight chance of snow showers between 10pm and 1am, then a chance of light snow after 1am. Cloudy, with a low around 22. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Sunday
A 20 percent chance of light snow before 10am. Partly sunny, with a high near 34. Wind chill values between 20 and 25. Northwest wind 5 to 14 mph.
Sunday Night
Partly cloudy, with a low around 18. Northwest wind 7 to 13 mph.
Monday
Increasing clouds, with a high near 32.
Monday Night
Cloudy, with a low around 23.
Tuesday
Mostly cloudy, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Mostly sunny, with a high near 45.
Thursday Night
Mostly cloudy, with a low around 34.
Friday
A 30 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
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
3:52 pm EST Jan 2, 2026
Forecast Valid:
8pm EST Jan 2, 2026-6pm EST Jan 9, 2026
 
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Additional Resources

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Chance of Precipitation