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.

Partly Cloudy

42°F

6°C

Humidity 62%
Wind Speed Calm
Barometer 30.12 in (1019.9 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 7 Dec 9:56 am EST
Extended Forecast for

Nesconset NY

  • Today

    Today: Partly sunny, with a high near 42. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 42 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 5 to 13 mph becoming northwest after midnight. Winds could gust as high as 25 mph.

    Low: 23 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 31. Wind chill values between 10 and 20. North wind 10 to 15 mph, with gusts as high as 29 mph.

    High: 31 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 15. North wind 5 to 7 mph becoming calm after midnight.

    Low: 15 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 40. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 40 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain. Mostly cloudy, with a high near 48.

    High: 48 °F

    Chance Rain

  • Wednesday Night

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

    Low: 34 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 42. Calm wind becoming southwest around 6 mph in the afternoon.
Tonight
Partly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 5 to 13 mph becoming northwest after midnight. Winds could gust as high as 25 mph.
Monday
Mostly sunny, with a high near 31. Wind chill values between 10 and 20. North wind 10 to 15 mph, with gusts as high as 29 mph.
Monday Night
Partly cloudy, with a low around 15. North wind 5 to 7 mph becoming calm after midnight.
Tuesday
Increasing clouds, with a high near 40. Calm wind becoming south 5 to 9 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 48.
Wednesday Night
A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 34.
Thursday
Mostly sunny, with a high near 43.
Thursday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 29.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 40. Chance of precipitation is 40%.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Nesconset NY
 40.86°N 73.16°W (Elev. 98 ft)
Last Update:
7:42 am EST Dec 7, 2025
Forecast Valid:
10am EST Dec 7, 2025-6pm EST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation