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.

Overcast

22°F

-6°C

Humidity 75%
Wind Speed Calm
Barometer 30.62 in (1037.2 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Last update 3 Mar 1:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 20. Light east wind.

    Low: 20 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of snow before 10am, then rain and snow between 10am and 11am, then rain after 11am. High near 39. Wind chill values between 20 and 30. East wind 5 to 8 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 39 °F

    Rain/Snow
    then Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before 1am. Low around 35. Light and variable wind becoming southwest 5 to 8 mph in the evening. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: Partly sunny, with a high near 45. Northwest wind around 5 mph becoming calm in the morning.

    High: 45 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain likely, mainly before 1pm. Cloudy, with a high near 44. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 44 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Rain Likely

  • Friday

    Friday: A 50 percent chance of rain before 1pm. Cloudy, with a high near 43.

    High: 43 °F

    Chance Rain

  • Friday Night

    Friday Night: Cloudy, with a low around 36.

    Low: 36 °F

    Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 20. Light east wind.
Tuesday
A chance of snow before 10am, then rain and snow between 10am and 11am, then rain after 11am. High near 39. Wind chill values between 20 and 30. East wind 5 to 8 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Tuesday Night
Rain, mainly before 1am. Low around 35. Light and variable wind becoming southwest 5 to 8 mph in the evening. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Partly sunny, with a high near 45. Northwest wind around 5 mph becoming calm in the morning.
Wednesday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 34. Calm wind.
Thursday
Rain likely, mainly before 1pm. Cloudy, with a high near 44. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain before 1pm. Cloudy, with a high near 43.
Friday Night
Cloudy, with a low around 36.
Saturday
Cloudy, with a high near 51.
Saturday Night
Rain likely. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.
Sunday
Mostly cloudy, with a high near 56.
Sunday Night
A 30 percent chance of rain. Partly cloudy, with a low around 43.
Monday
Partly sunny, with a high near 58.
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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:
12:43 am EST Mar 3, 2026
Forecast Valid:
2am EST Mar 3, 2026-6pm EDT Mar 9, 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