National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

14°F

-10°C

Humidity 80%
Wind Speed Calm
Barometer 29.91 in (1012.9 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Last update 25 Feb 12:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 30 percent chance of snow after 5am. Increasing clouds, with a low around 14. Calm wind becoming south 5 to 7 mph.

    Low: 14 °F

    Chance Snow

  • Wednesday

    Wednesday: Snow, possibly mixing with rain after 10am, then gradually ending. High near 39. Wind chill values between 25 and 30. Southwest wind 10 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    High: 39 °F

    Rain/Snow
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. West wind around 7 mph.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of snow after 1pm. Partly sunny, with a high near 37. Wind chill values between 25 and 35. West wind 3 to 6 mph.

    High: 37 °F

    Mostly Sunny
    then Chance
    Snow

  • Thursday Night

    Thursday Night: A 20 percent chance of snow before 1am. Mostly cloudy, with a low around 25. Calm wind.

    Low: 25 °F

    Slight Chance
    Snow

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of snow after 5am. Increasing clouds, with a low around 14. Calm wind becoming south 5 to 7 mph.
Wednesday
Snow, possibly mixing with rain after 10am, then gradually ending. High near 39. Wind chill values between 25 and 30. Southwest wind 10 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Wednesday Night
Partly cloudy, with a low around 29. West wind around 7 mph.
Thursday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 37. Wind chill values between 25 and 35. West wind 3 to 6 mph.
Thursday Night
A 20 percent chance of snow before 1am. Mostly cloudy, with a low around 25. Calm wind.
Friday
Mostly sunny, with a high near 37.
Friday Night
Partly cloudy, with a low around 27.
Saturday
Mostly sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 28.
Sunday
Partly sunny, with a high near 38.
Sunday Night
Partly cloudy, with a low around 19.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 29.
Monday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 19.
Tuesday
A 30 percent chance of snow. Partly sunny, with a high near 36.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
1:23 am EST Feb 25, 2026
Forecast Valid:
1am EST Feb 25, 2026-6pm EST Mar 3, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation