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.

Mostly Cloudy

31°F

-1°C

Humidity 42%
Wind Speed W 17 G 29 mph
Barometer 29.61 in (1002.8 mb)
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 30 Dec 7:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Wind Advisory December 30, 08:44am until December 30, 06:00pm
Click here for hazard details and duration
Wind Advisory
  •  
    Wind Advisory December 30, 08:44am until December 30, 06:00pm

    NOW until 6:00pm Tue

    Wind Advisory

  • Today

    High: 34 °F

    Mostly Cloudy
    and Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 14 to 17 mph, with gusts as high as 37 mph.

    Low: 23 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 36. Wind chill values between 10 and 20. West wind around 15 mph.

    High: 36 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of snow after 1am. Mostly cloudy, with a low around 23. Wind chill values between 15 and 20. Southwest wind 10 to 13 mph.

    Low: 23 °F

    Mostly Cloudy
    then Chance
    Snow

  • New Year's Day

    New Year's Day: A 20 percent chance of snow before 1pm. Mostly sunny, with a high near 32. Northwest wind 13 to 16 mph.

    High: 32 °F

    Slight Chance
    Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

Detailed Forecast

Today
Mostly cloudy, with a high near 34. Wind chill values between 15 and 20. Breezy, with a west wind 21 to 23 mph, with gusts as high as 47 mph.
Tonight
Mostly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 14 to 17 mph, with gusts as high as 37 mph.
Wednesday
Partly sunny, with a high near 36. Wind chill values between 10 and 20. West wind around 15 mph.
Wednesday Night
A 40 percent chance of snow after 1am. Mostly cloudy, with a low around 23. Wind chill values between 15 and 20. Southwest wind 10 to 13 mph.
New Year's Day
A 20 percent chance of snow before 1pm. Mostly sunny, with a high near 32. Northwest wind 13 to 16 mph.
Thursday Night
Partly cloudy, with a low around 18.
Friday
Partly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Partly sunny, with a high near 34.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Sunny, with a high near 33.
Sunday Night
Partly cloudy, with a low around 22.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
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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:
1:04 am EST Dec 30, 2025
Forecast Valid:
8am EST Dec 30, 2025-6pm EST Jan 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation