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

32°F

0°C

Humidity 33%
Wind Speed NW 16 mph
Barometer 29.98 in (1015.3 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 2 Feb 4:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 12. Northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 12 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 34. Wind chill values between 10 and 20. Calm wind becoming west 5 to 7 mph in the morning.

    High: 34 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of light snow between 1am and 4am. Mostly cloudy, with a low around 20. Calm wind. Chance of precipitation is 20%.

    Low: 20 °F

    Mostly Cloudy
    then Slight
    Chance Light
    Snow

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 34. Wind chill values between 20 and 30. Calm wind becoming northwest 5 to 8 mph in the morning.

    High: 34 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 15. Calm wind.

    Low: 15 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 12.

    Low: 12 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of snow after 1pm. Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny
    then Chance
    Snow

  • Friday Night

    Friday Night: A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 8.

    Low: 8 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 12. Northwest wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 34. Wind chill values between 10 and 20. Calm wind becoming west 5 to 7 mph in the morning.
Tuesday Night
A slight chance of light snow between 1am and 4am. Mostly cloudy, with a low around 20. Calm wind. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 34. Wind chill values between 20 and 30. Calm wind becoming northwest 5 to 8 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 15. Calm wind.
Thursday
Mostly sunny, with a high near 28.
Thursday Night
Partly cloudy, with a low around 12.
Friday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 30.
Friday Night
A 30 percent chance of snow before 1am. Mostly cloudy, with a low around 8.
Saturday
Mostly sunny and cold, with a high near 17. Blustery.
Saturday Night
Partly cloudy, with a low around 6.
Sunday
Partly sunny and cold, with a high near 19.
Sunday Night
Partly cloudy, with a low around 7.
Monday
Mostly sunny, with a high near 23.
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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:
1:22 pm EST Feb 2, 2026
Forecast Valid:
5pm EST Feb 2, 2026-6pm EST Feb 9, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation