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

24°F

-4°C

Humidity 81%
Wind Speed W 3 mph
Barometer 30.19 in (1022.5 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 27 Dec 11:56 pm EST
Extended Forecast for

Stony Brook NY

  • Overnight

    Overnight: Mostly clear, with a low around 21. Wind chill values between 10 and 15. North wind around 7 mph.

    Low: 21 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of rain after 4pm. Increasing clouds, with a high near 38. Wind chill values between 15 and 25. Northwest wind 5 to 8 mph becoming southwest in the afternoon.

    High: 38 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain, mainly before 4am. Temperature rising to around 42 by 5am. South wind 6 to 11 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 32 °F⇑

    Rain

  • Monday

    Monday: Rain, mainly after 7am. High near 51. South wind 10 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Rain

  • Monday Night

    Monday Night: Mostly cloudy during the early evening, then becoming mostly clear, with a low around 25. Breezy, with a west wind 18 to 20 mph, with gusts as high as 32 mph.

    Low: 25 °F

    Mostly Clear
    and Breezy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 33. Breezy.

    High: 33 °F

    Mostly Cloudy
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 21. Wind chill values between 10 and 15. North wind around 7 mph.
Sunday
A 20 percent chance of rain after 4pm. Increasing clouds, with a high near 38. Wind chill values between 15 and 25. Northwest wind 5 to 8 mph becoming southwest in the afternoon.
Sunday Night
Rain, mainly before 4am. Temperature rising to around 42 by 5am. South wind 6 to 11 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain, mainly after 7am. High near 51. South wind 10 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Mostly cloudy during the early evening, then becoming mostly clear, with a low around 25. Breezy, with a west wind 18 to 20 mph, with gusts as high as 32 mph.
Tuesday
Mostly cloudy, with a high near 33. Breezy.
Tuesday Night
Mostly cloudy, with a low around 25.
Wednesday
Partly sunny, with a high near 35.
Wednesday Night
Mostly cloudy, with a low around 24.
New Year's Day
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 30.
Friday Night
Partly cloudy, with a low around 20.
Saturday
Mostly sunny, with a high near 36.
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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:
1:17 am EST Dec 28, 2025
Forecast Valid:
2am EST Dec 28, 2025-6pm EST Jan 3, 2026
 
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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