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.

Blowing Snow

26°F

-3°C

Humidity 55%
Wind Speed N 18 G 31 mph
Barometer 30.00 in (1016.0 mb)
Dewpoint 12°F (-11°C)
Visibility 6.00 mi
Wind Chill13°F (-11°C)
Last update 14 Dec 6:56 pm EST
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 16. Wind chill values between zero and 10. Blustery, with a northwest wind 18 to 24 mph, with gusts as high as 34 mph.

    Low: 16 °F

    Decreasing
    Clouds and
    Blustery

  • Monday

    Monday: A 20 percent chance of snow showers after 1pm. Increasing clouds, with a high near 29. Wind chill values between zero and 10. Northwest wind 14 to 16 mph.

    High: 29 °F

    Sunny then
    Slight Chance
    Snow Showers

  • Monday Night

    Monday Night: A 20 percent chance of snow showers before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 22. Wind chill values between 15 and 20. West wind 9 to 11 mph.

    Low: 22 °F

    Slight Chance
    Snow Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 32. Wind chill values between 15 and 25. West wind around 6 mph.

    High: 32 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 25. Southwest wind 6 to 8 mph.

    Low: 25 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 52.

    High: 52 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Rain. Low around 44. Breezy. Chance of precipitation is 80%.

    Low: 44 °F

    Rain and
    Breezy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 16. Wind chill values between zero and 10. Blustery, with a northwest wind 18 to 24 mph, with gusts as high as 34 mph.
Monday
A 20 percent chance of snow showers after 1pm. Increasing clouds, with a high near 29. Wind chill values between zero and 10. Northwest wind 14 to 16 mph.
Monday Night
A 20 percent chance of snow showers before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 22. Wind chill values between 15 and 20. West wind 9 to 11 mph.
Tuesday
Mostly sunny, with a high near 32. Wind chill values between 15 and 25. West wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 25. Southwest wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 52.
Thursday Night
Rain. Low around 44. Breezy. Chance of precipitation is 80%.
Friday
A 40 percent chance of rain before 1pm. Partly sunny, with a high near 51. Breezy.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Partly sunny, with a high near 41.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 46.
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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:
3:34 pm EST Dec 14, 2025
Forecast Valid:
7pm EST Dec 14, 2025-6pm EST Dec 21, 2025
 
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Additional Resources

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Chance of Precipitation