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

32°F

0°C

Humidity 75%
Wind Speed Calm
Barometer 29.91 in (1013.0 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 26 Feb 9:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 23. Light and variable wind.

    Low: 23 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 39. Calm wind becoming south around 6 mph in the afternoon.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 29. Light south wind.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 44. South wind 3 to 8 mph.

    High: 44 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Calm wind becoming north around 6 mph after midnight.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of snow after 1pm. Partly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny
    then Chance
    Snow

  • Monday Night

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

    Low: 19 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 23. Light and variable wind.
Friday
Sunny, with a high near 39. Calm wind becoming south around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 29. Light south wind.
Saturday
Mostly sunny, with a high near 44. South wind 3 to 8 mph.
Saturday Night
Partly cloudy, with a low around 29. Calm wind becoming north around 6 mph after midnight.
Sunday
Partly sunny, with a high near 36.
Sunday Night
Partly cloudy, with a low around 17.
Monday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 28.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Partly sunny, with a high near 38.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 29.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 44.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30.
Thursday
A 30 percent chance of rain. Mostly cloudy, 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:
9:33 pm EST Feb 26, 2026
Forecast Valid:
10pm EST Feb 26, 2026-6pm EST Mar 5, 2026
 
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Additional Resources

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