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

29°F

-2°C

Humidity 56%
Wind Speed SW 6 mph
Barometer 29.75 in (1007.6 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 31 Dec 8:56 pm EST
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: Light snow, mainly between 10pm and 4am. Steady temperature around 30. Wind chill values between 20 and 25. Southwest wind 8 to 13 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of less than one inch possible.

    Low: 30 °F

    Chance Light
    Snow then
    Light Snow

  • New Year's Day

    New Year's Day: A 50 percent chance of snow showers before 10am. Mostly sunny, with a temperature falling to around 24 by 4pm. Wind chill values between 10 and 20. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 32 mph.

    High: 32 °F⇓

    Chance Snow
    Showers and
    Breezy then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 17. Wind chill values between 5 and 10. West wind 9 to 13 mph, with gusts as high as 23 mph.

    Low: 17 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 31. Wind chill values between 5 and 15. West wind 9 to 13 mph.

    High: 31 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 22. West wind around 8 mph.

    Low: 22 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 32.

    High: 32 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

Detailed Forecast

Tonight
Light snow, mainly between 10pm and 4am. Steady temperature around 30. Wind chill values between 20 and 25. Southwest wind 8 to 13 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of less than one inch possible.
New Year's Day
A 50 percent chance of snow showers before 10am. Mostly sunny, with a temperature falling to around 24 by 4pm. Wind chill values between 10 and 20. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 32 mph.
Thursday Night
Partly cloudy, with a low around 17. Wind chill values between 5 and 10. West wind 9 to 13 mph, with gusts as high as 23 mph.
Friday
Mostly sunny, with a high near 31. Wind chill values between 5 and 15. West wind 9 to 13 mph.
Friday Night
Partly cloudy, with a low around 22. West wind around 8 mph.
Saturday
Increasing clouds, with a high near 32.
Saturday Night
Mostly cloudy, with a low around 23.
Sunday
Mostly sunny, with a high near 35.
Sunday Night
Mostly clear, with a low around 19.
Monday
Partly sunny, with a high near 33.
Monday Night
Mostly cloudy, with a low around 25.
Tuesday
Partly sunny, with a high near 38.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
1:50 pm EST Dec 31, 2025
Forecast Valid:
9pm EST Dec 31, 2025-6pm EST Jan 7, 2026
 
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Additional Resources

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Chance of Precipitation