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.

Fair

11°F

-12°C

Humidity 53%
Wind Speed W 7 mph
Barometer 30.16 in (1021.5 mb)
Dewpoint -3°F (-19°C)
Visibility 10.00 mi
Wind Chill0°F (-18°C)
Last update 30 Jan 10:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

Cold Weather Advisory January 30, 11:12pm until January 31, 10:00am
Click here for hazard details and duration
Cold Weather Advisory
  •  
    Cold Weather Advisory January 30, 11:12pm until January 31, 10:00am

    NOW until 10:00am Sat

    Cold Weather Advisory

  • Tonight

    Low: 8 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 23. Wind chill values between zero and 10. Northwest wind 6 to 8 mph.

    High: 23 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 15. Wind chill values between zero and 10. Blustery, with a north wind 11 to 16 mph increasing to 19 to 24 mph after midnight.

    Low: 15 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    and Blustery

  • Sunday

    Sunday: A 20 percent chance of snow. Cloudy, with a high near 27. Wind chill values between -5 and 5. Blustery, with a north wind 22 to 25 mph, with gusts as high as 37 mph.

    High: 27 °F

    Slight Chance
    Snow and
    Blustery

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 17. Blustery, with a northwest wind 14 to 22 mph, with gusts as high as 32 mph.

    Low: 17 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 31.

    High: 31 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 17.

    Low: 17 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 31.

    High: 31 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 8. Wind chill values between zero and 5. Northwest wind 7 to 9 mph.
Saturday
Mostly sunny, with a high near 23. Wind chill values between zero and 10. Northwest wind 6 to 8 mph.
Saturday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 15. Wind chill values between zero and 10. Blustery, with a north wind 11 to 16 mph increasing to 19 to 24 mph after midnight.
Sunday
A 20 percent chance of snow. Cloudy, with a high near 27. Wind chill values between -5 and 5. Blustery, with a north wind 22 to 25 mph, with gusts as high as 37 mph.
Sunday Night
Mostly cloudy, with a low around 17. Blustery, with a northwest wind 14 to 22 mph, with gusts as high as 32 mph.
Monday
Mostly sunny, with a high near 31.
Monday Night
Mostly clear, with a low around 17.
Tuesday
Sunny, with a high near 31.
Tuesday Night
Partly cloudy, with a low around 19.
Wednesday
Mostly sunny, with a high near 31.
Wednesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 18.
Thursday
A 30 percent chance of snow. Partly sunny, with a high near 29.
Thursday Night
Partly cloudy, with a low around 16.
Friday
Partly sunny, with a high near 29.
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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:
1:28 pm EST Jan 30, 2026
Forecast Valid:
11pm EST Jan 30, 2026-6pm EST Feb 6, 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