National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

17°F

-8°C

Humidity 47%
Wind Speed NW 18 G 30 mph
Barometer 29.92 in (1013.2 mb)
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill1°F (-17°C)
Last update 26 Jan 11:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Mostly clear, with a low around 15. Wind chill values between zero and 5. Northwest wind 15 to 18 mph.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of flurries after noon. Increasing clouds, with a high near 22. Wind chill values between zero and 10. West wind 13 to 16 mph.

    High: 22 °F

    Chance
    Flurries

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 13. Wind chill values between zero and 5. West wind 13 to 15 mph.

    Low: 13 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 23. Wind chill values between zero and 10. West wind 8 to 11 mph.

    High: 23 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 12. West wind around 8 mph.

    Low: 12 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 22.

    High: 22 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 9 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny and cold, with a high near 20.

    High: 20 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 9.

    Low: 9 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 15. Wind chill values between zero and 5. Northwest wind 15 to 18 mph.
Tuesday
A chance of flurries after noon. Increasing clouds, with a high near 22. Wind chill values between zero and 10. West wind 13 to 16 mph.
Tuesday Night
Mostly clear, with a low around 13. Wind chill values between zero and 5. West wind 13 to 15 mph.
Wednesday
Mostly sunny, with a high near 23. Wind chill values between zero and 10. West wind 8 to 11 mph.
Wednesday Night
Mostly cloudy, with a low around 12. West wind around 8 mph.
Thursday
Mostly sunny, with a high near 22.
Thursday Night
Mostly clear, with a low around 9.
Friday
Mostly sunny and cold, with a high near 20.
Friday Night
Partly cloudy, with a low around 9.
Saturday
Mostly sunny, with a high near 24.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 16.
Sunday
A 30 percent chance of snow. Partly sunny, with a high near 28.
Sunday Night
Mostly cloudy, with a low around 18. Blustery.
Monday
Mostly sunny, with a high near 31.
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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:
6:03 pm EST Jan 26, 2026
Forecast Valid:
12am EST Jan 27, 2026-6pm EST Feb 2, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation