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

38°F

3°C

Humidity 52%
Wind Speed W 7 mph
Barometer 30.05 in (1017.7 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 22 Jan 9:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Winter Storm Watch January 25, 03:00am until January 26, 06:00pm
Cold Weather Advisory January 23, 10:00pm until January 24, 10:00am
Click here for hazard details and duration
Winter Storm Watch
Cold Weather Advisory

  • Tonight

    Tonight: Partly cloudy, with a low around 26. Wind chill values between 20 and 25. West wind 9 to 14 mph, with gusts as high as 25 mph.

    Low: 26 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 36. Wind chill values between 20 and 30. West wind 6 to 15 mph, with gusts as high as 30 mph.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 9. Wind chill values between -5 and 5. Northwest wind 9 to 15 mph, with gusts as high as 31 mph.

    Low: 9 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 18. Wind chill values between -5 and 5. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: A 40 percent chance of snow after 1am. Cloudy, with a low around 12. North wind 3 to 5 mph.

    Low: 12 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow. The snow could be heavy at times. High near 28. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.

    High: 28 °F

    Heavy Snow

  • Sunday Night

    Sunday Night: Snow. Low around 21. Chance of precipitation is 100%.

    Low: 21 °F

    Snow

  • Monday

    Monday: Snow likely, mainly before noon. Mostly cloudy, with a high near 29. Chance of precipitation is 60%.

    High: 29 °F

    Snow Likely

  • Monday Night

    Monday Night: A 30 percent chance of snow showers before 7pm. Partly cloudy, with a low around 12.

    Low: 12 °F

    Chance Snow
    Showers then
    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 26. Wind chill values between 20 and 25. West wind 9 to 14 mph, with gusts as high as 25 mph.
Friday
Mostly sunny, with a high near 36. Wind chill values between 20 and 30. West wind 6 to 15 mph, with gusts as high as 30 mph.
Friday Night
Partly cloudy, with a low around 9. Wind chill values between -5 and 5. Northwest wind 9 to 15 mph, with gusts as high as 31 mph.
Saturday
Mostly sunny and cold, with a high near 18. Wind chill values between -5 and 5. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 40 percent chance of snow after 1am. Cloudy, with a low around 12. North wind 3 to 5 mph.
Sunday
Snow. The snow could be heavy at times. High near 28. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.
Sunday Night
Snow. Low around 21. Chance of precipitation is 100%.
Monday
Snow likely, mainly before noon. Mostly cloudy, with a high near 29. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of snow showers before 7pm. Partly cloudy, with a low around 12.
Tuesday
Mostly sunny, with a high near 23.
Tuesday Night
Mostly clear, with a low around 12.
Wednesday
Mostly sunny, with a high near 26.
Wednesday Night
Mostly cloudy, with a low around 14.
Thursday
Partly sunny, with a high near 25.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
6:13 pm EST Jan 22, 2026
Forecast Valid:
10pm EST Jan 22, 2026-6pm EST Jan 29, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation