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.

Mostly Cloudy

35°F

2°C

Humidity 72%
Wind Speed W 8 mph
Barometer 29.98 in (1015.1 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 4 Dec 7:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Sunny through mid morning, then becoming mostly cloudy, with a high near 42. Breezy, with a west wind 11 to 21 mph, with gusts as high as 31 mph.

    High: 42 °F

    Partly Sunny
    then
    Decreasing
    Clouds and
    Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 18. Wind chill values between 10 and 15. Blustery, with a north wind 17 to 22 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 32 mph.

    Low: 18 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Friday

    Friday: A 20 percent chance of light snow after 4pm. Increasing clouds, with a high near 36. Wind chill values between 10 and 20. Light and variable wind becoming southeast 5 to 7 mph in the morning.

    High: 36 °F

    Mostly Sunny
    then Slight
    Chance Light
    Snow

  • Friday Night

    Friday Night: A 40 percent chance of light snow, mainly after 7pm. Mostly cloudy, with a low around 29. Light and variable wind.

    Low: 29 °F

    Chance Light
    Snow

  • Saturday

    Saturday: A 30 percent chance of light rain, mainly before 10am. Mostly cloudy, with a high near 43. Light and variable wind becoming west 5 to 10 mph in the morning.

    High: 43 °F

    Chance Light
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny through mid morning, then becoming mostly cloudy, with a high near 42. Breezy, with a west wind 11 to 21 mph, with gusts as high as 31 mph.
Tonight
Mostly clear, with a low around 18. Wind chill values between 10 and 15. Blustery, with a north wind 17 to 22 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 32 mph.
Friday
A 20 percent chance of light snow after 4pm. Increasing clouds, with a high near 36. Wind chill values between 10 and 20. Light and variable wind becoming southeast 5 to 7 mph in the morning.
Friday Night
A 40 percent chance of light snow, mainly after 7pm. Mostly cloudy, with a low around 29. Light and variable wind.
Saturday
A 30 percent chance of light rain, mainly before 10am. Mostly cloudy, with a high near 43. Light and variable wind becoming west 5 to 10 mph in the morning.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Partly sunny, with a high near 44.
Sunday Night
Mostly cloudy, with a low around 24.
Monday
Mostly sunny, with a high near 34.
Monday Night
Partly cloudy, with a low around 20.
Tuesday
Partly sunny, with a high near 41.
Tuesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 30.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 46.
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Forecast Area
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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:
6:44 am EST Dec 4, 2025
Forecast Valid:
8am EST Dec 4, 2025-6pm EST Dec 10, 2025
 
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