Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

11°F

-12°C

Humidity 51%
Wind Speed N 18 mph
Barometer 30.20 in (1022.7 mb)
Dewpoint -4°F (-20°C)
Visibility 10.00 mi
Wind Chill-7°F (-22°C)
Last update 9 Feb 1:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

Cold Weather Advisory February 9, 02:42am until February 9, 10:00am
Click here for hazard details and duration
Cold Weather Advisory
  •  
    Cold Weather Advisory February 9, 02:42am until February 9, 10:00am

    NOW until 10:00am Mon

    Cold Weather Advisory

  • Overnight

    Low: 10 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 27. Wind chill values between zero and 10. Northwest wind 8 to 11 mph.

    High: 27 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 20. Northwest wind around 6 mph becoming calm  in the evening.

    Low: 20 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of snow after 1pm.  Increasing clouds, with a high near 35. Wind chill values between 20 and 30. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 35 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Tuesday Night

    Tuesday Night: A chance of snow, mixing with rain after 10pm, then gradually ending.  Cloudy, then gradually becoming partly cloudy, with a low around 28. South wind 5 to 7 mph becoming west after midnight.  Chance of precipitation is 30%.

    Low: 28 °F

    Chance
    Rain/Snow

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

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

    Low: 24 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 10. Wind chill values between -5 and zero. Northwest wind 11 to 13 mph.
Monday
Sunny, with a high near 27. Wind chill values between zero and 10. Northwest wind 8 to 11 mph.
Monday Night
Mostly cloudy, with a low around 20. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
A 20 percent chance of snow after 1pm. Increasing clouds, with a high near 35. Wind chill values between 20 and 30. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
A chance of snow, mixing with rain after 10pm, then gradually ending. Cloudy, then gradually becoming partly cloudy, with a low around 28. South wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Partly cloudy, with a low around 24.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 33.
Friday Night
Mostly clear, with a low around 21.
Saturday
Sunny, with a high near 35.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 36. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
1:31 am EST Feb 9, 2026
2am EST Feb 9, 2026-6pm EST Feb 15, 2026
 
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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