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

41°F

5°C

Humidity 53%
Wind Speed W 15 G 26 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 7 Dec 9:56 pm EST
Extended Forecast for

Nesconset NY

  • Tonight

    Tonight: Partly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 10 to 17 mph becoming northwest after midnight.

    Low: 23 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a steady temperature around 27. Wind chill values between 15 and 20. North wind 10 to 17 mph, with gusts as high as 29 mph.

    High: 27 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 16. North wind around 6 mph becoming calm after midnight.

    Low: 16 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 41. Wind chill values between 20 and 30. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 41 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A slight chance of rain and snow before 1am, then a slight chance of snow. Mostly cloudy, with a low around 30. Southwest wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    Low: 30 °F

    Slight Chance
    Rain/Snow

  • 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. Cloudy, then gradually becoming partly 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

  • Thursday Night

    Thursday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 23. Wind chill values between 15 and 20. West wind 10 to 17 mph becoming northwest after midnight.
Monday
Mostly sunny, with a steady temperature around 27. Wind chill values between 15 and 20. North wind 10 to 17 mph, with gusts as high as 29 mph.
Monday Night
Mostly cloudy, with a low around 16. North wind around 6 mph becoming calm after midnight.
Tuesday
Increasing clouds, with a high near 41. Wind chill values between 20 and 30. Calm wind becoming south 5 to 8 mph in the afternoon.
Tuesday Night
A slight chance of rain and snow before 1am, then a slight chance of snow. Mostly cloudy, with a low around 30. Southwest wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 48.
Wednesday Night
A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly 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 27.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 38.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 24.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 35.
Saturday Night
Partly cloudy, with a low around 21.
Sunday
Mostly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nesconset NY
 40.86°N 73.16°W (Elev. 98 ft)
Last Update:
5:39 pm EST Dec 7, 2025
Forecast Valid:
10pm EST Dec 7, 2025-6pm EST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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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