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.

A Few Clouds

30°F

-1°C

Humidity 43%
Wind Speed Calm
Barometer 29.95 in (1014.4 mb)
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Last update 5 Feb 4:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

Extreme Cold Watch February 7, 06:00pm until February 8, 01:00pm
Click here for hazard details and duration
Extreme Cold Watch

  • Tonight

    Tonight: Increasing clouds, with a low around 19. Wind chill values between 10 and 15. Calm wind becoming northeast around 6 mph in the evening.

    Low: 19 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, with a high near 28. Wind chill values between 10 and 20. Northeast wind around 6 mph becoming calm in the afternoon.

    High: 28 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Snow, mainly after 1am. Steady temperature around 25. Wind chill values between 20 and 25. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 25 °F

    Chance Snow
    then Snow

  • Saturday

    Saturday: Snow likely, mainly before 1pm. Cloudy, with a temperature falling to around 16 by 5pm. Wind chill values between -5 and 5. Windy, with a northwest wind 8 to 18 mph increasing to 21 to 31 mph in the afternoon. Winds could gust as high as 48 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.

    High: 25 °F⇓

    Snow Likely
    and Windy

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 5. Windy, with a northwest wind 23 to 30 mph, with gusts as high as 44 mph.

    Low: 5 °F

    Decreasing
    Clouds and
    Windy

  • Sunday

    Sunday: Sunny and cold, with a high near 18. Blustery.

    High: 18 °F

    Sunny and
    Blustery then
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 9.

    Low: 9 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 25.

    High: 25 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 19. Wind chill values between 10 and 15. Calm wind becoming northeast around 6 mph in the evening.
Friday
Mostly cloudy, with a high near 28. Wind chill values between 10 and 20. Northeast wind around 6 mph becoming calm in the afternoon.
Friday Night
Snow, mainly after 1am. Steady temperature around 25. Wind chill values between 20 and 25. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Saturday
Snow likely, mainly before 1pm. Cloudy, with a temperature falling to around 16 by 5pm. Wind chill values between -5 and 5. Windy, with a northwest wind 8 to 18 mph increasing to 21 to 31 mph in the afternoon. Winds could gust as high as 48 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 5. Windy, with a northwest wind 23 to 30 mph, with gusts as high as 44 mph.
Sunday
Sunny and cold, with a high near 18. Blustery.
Sunday Night
Mostly clear, with a low around 9.
Monday
Mostly sunny, with a high near 25.
Monday Night
Partly cloudy, with a low around 14.
Tuesday
Mostly sunny, with a high near 29.
Tuesday Night
Mostly cloudy, with a low around 21.
Wednesday
A 30 percent chance of rain. Mostly sunny, with a high near 35.
Wednesday Night
Mostly cloudy, with a low around 27.
Thursday
Mostly cloudy, with a high near 36.
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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:
1:09 pm EST Feb 5, 2026
Forecast Valid:
5pm EST Feb 5, 2026-6pm EST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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