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.

Overcast and Breezy

29°F

-2°C

Humidity 47%
Wind Speed W 23 G 32 mph
Barometer 29.59 in (1002.0 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 30 Dec 5:56 am EST
Extended Forecast for

Islip NY

Wind Advisory December 30, 06:27am until December 30, 06:00pm
Click here for hazard details and duration
Wind Advisory
  •  
    Wind Advisory December 30, 06:27am until December 30, 06:00pm

    NOW until 6:00pm Tue

    Wind Advisory

  • Today

    High: 32 °F

    Partly Sunny
    and Breezy
    then Mostly
    Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 11 to 16 mph, with gusts as high as 34 mph.

    Low: 24 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 35. Wind chill values between 15 and 25. West wind 10 to 14 mph.

    High: 35 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 23. Southwest wind around 10 mph, with gusts as high as 22 mph.

    Low: 23 °F

    Chance Snow

  • New Year's Day

    New Year's Day: A 20 percent chance of snow before 1pm. Mostly sunny, with a high near 30. Northwest wind 10 to 14 mph.

    High: 30 °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
Partly sunny, with a high near 32. Wind chill values between 15 and 20. Breezy, with a west wind 17 to 20 mph, with gusts as high as 47 mph.
Tonight
Partly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 11 to 16 mph, with gusts as high as 34 mph.
Wednesday
Partly sunny, with a high near 35. Wind chill values between 15 and 25. West wind 10 to 14 mph.
Wednesday Night
A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 23. Southwest wind around 10 mph, with gusts as high as 22 mph.
New Year's Day
A 20 percent chance of snow before 1pm. Mostly sunny, with a high near 30. Northwest wind 10 to 14 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 33.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
Sunny, with a high near 33.
Sunday Night
Partly cloudy, with a low around 24.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:04 am EST Dec 30, 2025
Forecast Valid:
6am EST Dec 30, 2025-6pm EST Jan 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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