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

13°F

-11°C

Humidity 33%
Wind Speed NW 20 G 30 mph
Barometer 30.60 in (1036.4 mb)
Dewpoint -11°F (-24°C)
Visibility 10.00 mi
Wind Chill-5°F (-21°C)
Last update 24 Jan 11:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

Winter Storm Warning January 25, 03:00am until January 26, 06:00pm
Click here for hazard details and duration
Winter Storm Warning

  • This Afternoon

    This Afternoon: Mostly sunny and cold, with a high near 19. Wind chill values between zero and 10. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.

    High: 19 °F

    Cold

  • Tonight

    Tonight: A 30 percent chance of snow after 4am. Mostly 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, mainly after 7am. The snow could be heavy at times. High near 30. Wind chill values between 5 and 10. Northeast wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of 7 to 11 inches possible.

    High: 30 °F

    Heavy Snow

  • Sunday Night

    Sunday Night: Snow and sleet, becoming all snow after 4am. Steady temperature around 28. Wind chill values between 10 and 20. Blustery, with a northeast wind 14 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 2 to 4 inches possible.

    Low: 28 °F

    Snow/Sleet
    and Blustery

  • Monday

    Monday: Snow likely, mainly before 1pm. Cloudy, with a high near 30. North wind 11 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    High: 30 °F

    Snow Likely

  • Monday Night

    Monday Night: Partly cloudy, with a low around 13.

    Low: 13 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 21.

    High: 21 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 12.

    Low: 12 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny and cold, with a high near 19. Wind chill values between zero and 10. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.
Tonight
A 30 percent chance of snow after 4am. Mostly cloudy, with a low around 13. Wind chill values between 5 and 10. North wind 6 to 8 mph.
Sunday
Snow, mainly after 7am. The snow could be heavy at times. High near 30. Wind chill values between 5 and 10. Northeast wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of 7 to 11 inches possible.
Sunday Night
Snow and sleet, becoming all snow after 4am. Steady temperature around 28. Wind chill values between 10 and 20. Blustery, with a northeast wind 14 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 2 to 4 inches possible.
Monday
Snow likely, mainly before 1pm. Cloudy, with a high near 30. North wind 11 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Mostly sunny, with a high near 21.
Tuesday Night
Partly cloudy, with a low around 12.
Wednesday
Mostly sunny, with a high near 24.
Wednesday Night
Mostly cloudy, with a low around 12.
Thursday
Partly sunny, with a high near 22.
Thursday Night
Partly cloudy, with a low around 10.
Friday
Mostly sunny, with a high near 24.
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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:
1:05 am EST Jan 24, 2026
Forecast Valid:
12pm EST Jan 24, 2026-6pm EST Jan 30, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation