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

27°F

-3°C

Humidity 41%
Wind Speed W 15 G 25 mph
Barometer 29.51 in (999.4 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 15 Jan 9:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Partly cloudy, with a low around 21. Wind chill values between 10 and 20. West wind 11 to 15 mph, with gusts as high as 30 mph.

    Low: 21 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 36. Wind chill values between 5 and 15. West wind 10 to 16 mph, with gusts as high as 30 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of snow after 1am. Increasing clouds, with a low around 30. Wind chill values between 25 and 30. Southwest wind 5 to 7 mph.

    Low: 30 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then a chance of rain after 1pm. Mostly cloudy, with a high near 42. Southwest wind 5 to 9 mph. Chance of precipitation is 50%.

    High: 42 °F

    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 29. Southwest wind 3 to 5 mph.

    Low: 29 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 22.

    Low: 22 °F

    Decreasing
    Clouds

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 14.

    Low: 14 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 21. Wind chill values between 10 and 20. West wind 11 to 15 mph, with gusts as high as 30 mph.
Friday
Sunny, with a high near 36. Wind chill values between 5 and 15. West wind 10 to 16 mph, with gusts as high as 30 mph.
Friday Night
A 20 percent chance of snow after 1am. Increasing clouds, with a low around 30. Wind chill values between 25 and 30. Southwest wind 5 to 7 mph.
Saturday
A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then a chance of rain after 1pm. Mostly cloudy, with a high near 42. Southwest wind 5 to 9 mph. Chance of precipitation is 50%.
Saturday Night
Mostly cloudy, with a low around 29. Southwest wind 3 to 5 mph.
Sunday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 37.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 22.
M.L.King Day
Sunny, with a high near 33.
Monday Night
Mostly clear, with a low around 14.
Tuesday
Sunny, with a high near 23.
Tuesday Night
Mostly clear, with a low around 13.
Wednesday
Mostly sunny, with a high near 31.
Wednesday Night
Mostly cloudy, with a low around 23.
Thursday
Mostly sunny, with a high near 35.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
12:42 pm EST Jan 15, 2026
Forecast Valid:
10pm EST Jan 15, 2026-6pm EST Jan 22, 2026
 
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Additional Resources

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