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.

Mostly Cloudy

36°F

2°C

Humidity 35%
Wind Speed NW 18 G 26 mph
Barometer 30.04 in (1017.2 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 17 Mar 8:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: Partly cloudy, with a low around 26. Wind chill values between 20 and 25. Northwest wind 11 to 16 mph.

    Low: 26 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. Wind chill values between 20 and 30. Northwest wind 3 to 7 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 29. South wind around 6 mph becoming calm in the evening.

    Low: 29 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 44. South wind 3 to 7 mph.

    High: 44 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 33. South wind around 6 mph.

    Low: 33 °F

    Partly Cloudy
    then Slight
    Chance Snow
    Showers

  • Friday

    Friday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

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

    High: 50 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 26. Wind chill values between 20 and 25. Northwest wind 11 to 16 mph.
Wednesday
Mostly sunny, with a high near 38. Wind chill values between 20 and 30. Northwest wind 3 to 7 mph.
Wednesday Night
Mostly clear, with a low around 29. South wind around 6 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 44. South wind 3 to 7 mph.
Thursday Night
A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 33. South wind around 6 mph.
Friday
Partly sunny, with a high near 49.
Friday Night
Mostly cloudy, with a low around 37.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 50.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 38.
Sunday
Mostly cloudy, with a high near 52.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 38.
Monday
Mostly sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Sunny, with a high near 44.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
7:30 pm EDT Mar 17, 2026
Forecast Valid:
9pm EDT Mar 17, 2026-6pm EDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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