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

32°F

0°C

Humidity 33%
Wind Speed W 12 mph
Barometer 30.17 in (1021.6 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 23 Jan 8:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook 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

  • Today

    Today: Mostly sunny, with a high near 34. Wind chill values between 20 and 25. West wind 13 to 18 mph, with gusts as high as 28 mph.

    High: 34 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 10. Wind chill values between -5 and 5. Blustery, with a northwest wind 14 to 20 mph.

    Low: 10 °F

    Partly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 18. Wind chill values between -5 and 5. Northwest wind 9 to 14 mph.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: A 40 percent chance of snow after 1am. Cloudy, with a low around 13. Wind chill values between 5 and 10. North wind 6 to 8 mph.

    Low: 13 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow. The snow could be heavy at times. High near 28. Northeast wind 9 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New snow accumulation of 7 to 11 inches possible.

    High: 28 °F

    Heavy Snow

  • Sunday Night

    Sunday Night: Snow before 1am, then snow and sleet between 1am and 4am, then snow after 4am. Steady temperature around 26. Blustery. Chance of precipitation is 100%. New snow and sleet accumulation of 3 to 5 inches possible.

    Low: 26 °F

    Blustery.
    Snow then
    Snow/Sleet

  • Monday

    Monday: Snow likely, mainly before 1pm. Cloudy, with a high near 29. Chance of precipitation is 70%.

    High: 29 °F

    Snow Likely

  • Monday Night

    Monday Night: A 30 percent chance of snow before 1am. Partly cloudy, with a low around 13. Blustery.

    Low: 13 °F

    Chance Snow
    and Blustery

  • Tuesday

    Tuesday: Mostly sunny, with a high near 22.

    High: 22 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 34. Wind chill values between 20 and 25. West wind 13 to 18 mph, with gusts as high as 28 mph.
Tonight
Partly cloudy, with a low around 10. Wind chill values between -5 and 5. Blustery, with a northwest wind 14 to 20 mph.
Saturday
Mostly sunny and cold, with a high near 18. Wind chill values between -5 and 5. Northwest wind 9 to 14 mph.
Saturday Night
A 40 percent chance of snow after 1am. Cloudy, with a low around 13. Wind chill values between 5 and 10. North wind 6 to 8 mph.
Sunday
Snow. The snow could be heavy at times. High near 28. Northeast wind 9 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New snow accumulation of 7 to 11 inches possible.
Sunday Night
Snow before 1am, then snow and sleet between 1am and 4am, then snow after 4am. Steady temperature around 26. Blustery. Chance of precipitation is 100%. New snow and sleet accumulation of 3 to 5 inches possible.
Monday
Snow likely, mainly before 1pm. Cloudy, with a high near 29. Chance of precipitation is 70%.
Monday Night
A 30 percent chance of snow before 1am. Partly cloudy, with a low around 13. Blustery.
Tuesday
Mostly sunny, with a high near 22.
Tuesday Night
Partly cloudy, with a low around 13.
Wednesday
Mostly sunny, with a high near 25.
Wednesday Night
Partly cloudy, with a low around 12.
Thursday
Partly sunny, with a high near 23.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
2:28 am EST Jan 23, 2026
Forecast Valid:
9am EST Jan 23, 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