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

20°F

-7°C

Humidity 41%
Wind Speed W 13 G 24 mph
Barometer 30.26 in (1024.9 mb)
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill7°F (-14°C)
Last update 20 Jan 9:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Mostly sunny, with a high near 24. Wind chill values between 10 and 15. Breezy, with a west wind 16 to 20 mph, with gusts as high as 30 mph.

    High: 24 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 13. Wind chill values between 5 and 10. West wind 7 to 13 mph.

    Low: 13 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 39. Wind chill values between 5 and 15. South wind 6 to 14 mph.

    High: 39 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a steady temperature around 37. Southwest wind 11 to 14 mph, with gusts as high as 24 mph.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 45. Southwest wind 10 to 15 mph.

    High: 45 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 9.

    Low: 9 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

Detailed Forecast

Today
Mostly sunny, with a high near 24. Wind chill values between 10 and 15. Breezy, with a west wind 16 to 20 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 13. Wind chill values between 5 and 10. West wind 7 to 13 mph.
Wednesday
Increasing clouds, with a high near 39. Wind chill values between 5 and 15. South wind 6 to 14 mph.
Wednesday Night
Mostly cloudy, with a steady temperature around 37. Southwest wind 11 to 14 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 45. Southwest wind 10 to 15 mph.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 9.
Saturday
Partly sunny and cold, with a high near 18.
Saturday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 9.
Sunday
Snow likely. Mostly cloudy, with a high near 22. Chance of precipitation is 60%.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 12.
Monday
Mostly sunny, with a high near 25.
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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:
1:07 am EST Jan 20, 2026
Forecast Valid:
11am EST Jan 20, 2026-6pm EST Jan 26, 2026
 
Forecast Discussion
 
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Additional Resources

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