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.

A Few Clouds

28°F

-2°C

Humidity 37%
Wind Speed Calm
Barometer 30.23 in (1023.9 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Last update 9 Dec 10:56 am EST
Extended Forecast for

Nesconset NY

  • Today

    Today: Mostly sunny, with a high near 33. Wind chill values between 25 and 30. Calm wind becoming south around 6 mph in the afternoon.

    High: 33 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. Wind chill values between 20 and 25. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.

    Low: 30 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 48. Wind chill values between 25 and 35 early. South wind 10 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Slight Chance
    Rain then
    Rain Likely

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 9 to 13 mph, with gusts as high as 24 mph.

    Low: 31 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 39. West wind 10 to 16 mph, with gusts as high as 29 mph.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.

    Low: 27 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 33. Wind chill values between 25 and 30. Calm wind becoming south around 6 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 30. Wind chill values between 20 and 25. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 48. Wind chill values between 25 and 35 early. South wind 10 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 9 to 13 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 39. West wind 10 to 16 mph, with gusts as high as 29 mph.
Thursday Night
Partly cloudy, with a low around 26.
Friday
Mostly sunny, with a high near 37.
Friday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 40.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 25.
Sunday
A 30 percent chance of snow. Partly sunny, with a high near 34.
Sunday Night
Partly cloudy, with a low around 17.
Monday
Mostly sunny, with a high near 30.
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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:
5:28 am EST Dec 9, 2025
Forecast Valid:
11am EST Dec 9, 2025-6pm EST Dec 15, 2025
 
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