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 and Breezy

26°F

-3°C

Humidity 55%
Wind Speed NW 21 G 33 mph
Barometer 29.78 in
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 1 Jan 3:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A chance of flurries after 1am. Increasing clouds, with a steady temperature around 23. Wind chill values between 10 and 15. West wind 8 to 16 mph.

    Low: 23 °F

    Chance
    Flurries

  • Friday

    Friday: Cloudy, then gradually becoming mostly sunny, with a high near 32. Wind chill values between 10 and 20. West wind 10 to 14 mph.

    High: 32 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20. Wind chill values between 15 and 20. West wind around 9 mph.

    Low: 20 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 33. Wind chill values between 15 and 25. West wind 8 to 10 mph.

    High: 33 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Cloudy, with a low around 23. Light west wind.

    Low: 23 °F

    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A chance of flurries after 1am. Increasing clouds, with a steady temperature around 23. Wind chill values between 10 and 15. West wind 8 to 16 mph.
Friday
Cloudy, then gradually becoming mostly sunny, with a high near 32. Wind chill values between 10 and 20. West wind 10 to 14 mph.
Friday Night
Partly cloudy, with a low around 20. Wind chill values between 15 and 20. West wind around 9 mph.
Saturday
Increasing clouds, with a high near 33. Wind chill values between 15 and 25. West wind 8 to 10 mph.
Saturday Night
Cloudy, with a low around 23. Light west wind.
Sunday
Mostly sunny, with a high near 34.
Sunday Night
Partly cloudy, with a low around 19.
Monday
Partly sunny, with a high near 35.
Monday Night
Mostly cloudy, with a low around 25.
Tuesday
Mostly cloudy, with a high near 43.
Tuesday Night
Cloudy, with a low around 33.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 47.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Mostly sunny, with a high near 44.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
12:21 pm EST Jan 1, 2026
Forecast Valid:
4pm EST Jan 1, 2026-6pm EST Jan 8, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation