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

41°F

5°C

Humidity 35%
Wind Speed W 18 G 29 mph
Barometer 29.84 in (1010.4 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 17 Mar 12:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: A chance of flurries after 5pm. Mostly sunny, with a high near 42. Breezy, with a west wind 20 to 22 mph, with gusts as high as 33 mph.

    High: 42 °F

    Chance
    Flurries and
    Breezy

  • Tonight

    Tonight: A chance of flurries before 11pm. Partly cloudy, with a low around 26. Wind chill values between 15 and 20. Northwest wind 14 to 17 mph.

    Low: 26 °F

    Chance
    Flurries

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. Wind chill values between 15 and 25. Northwest wind 6 to 9 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 27. South wind 5 to 7 mph becoming calm after midnight.

    Low: 27 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 44. South wind 3 to 8 mph.

    High: 44 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of rain after 2am. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 50.

    High: 50 °F

    Chance Rain

Detailed Forecast

This Afternoon
A chance of flurries after 5pm. Mostly sunny, with a high near 42. Breezy, with a west wind 20 to 22 mph, with gusts as high as 33 mph.
Tonight
A chance of flurries before 11pm. Partly cloudy, with a low around 26. Wind chill values between 15 and 20. Northwest wind 14 to 17 mph.
Wednesday
Mostly sunny, with a high near 38. Wind chill values between 15 and 25. Northwest wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 27. South wind 5 to 7 mph becoming calm after midnight.
Thursday
Mostly sunny, with a high near 44. South wind 3 to 8 mph.
Thursday Night
Partly cloudy, with a low around 35.
Friday
Partly sunny, with a high near 50.
Friday Night
A 40 percent chance of rain after 2am. Mostly cloudy, with a low around 38.
Saturday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 50.
Saturday Night
A 30 percent chance of rain after 8pm. Mostly cloudy, with a low around 37.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 50.
Sunday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 33.
Monday
Partly sunny, with a high near 45.
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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:
7:54 am EDT Mar 17, 2026
Forecast Valid:
1pm EDT Mar 17, 2026-6pm EDT Mar 23, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation