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

40°F

4°C

Humidity 89%
Wind Speed Calm
Barometer 29.93 in (1013.5 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 6 Dec 9:56 am EST
Extended Forecast for

Nesconset NY

  • Today

    Today: A slight chance of drizzle before 1pm. Mostly cloudy, with a high near 41. Light and variable wind becoming west 5 to 7 mph in the afternoon.

    High: 41 °F

    Slight Chance
    Drizzle

  • Tonight

    Tonight: Partly cloudy, with a low around 28. Northwest wind 3 to 5 mph.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 41. Calm wind becoming north around 5 mph in the morning.

    High: 41 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 24. Wind chill values between 15 and 20. Light west wind becoming northwest 6 to 11 mph in the evening. Winds could gust as high as 23 mph.

    Low: 24 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 32. North wind 10 to 15 mph, with gusts as high as 28 mph.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

  • Tuesday Night

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

    Low: 31 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 47.

    High: 47 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Today
A slight chance of drizzle before 1pm. Mostly cloudy, with a high near 41. Light and variable wind becoming west 5 to 7 mph in the afternoon.
Tonight
Partly cloudy, with a low around 28. Northwest wind 3 to 5 mph.
Sunday
Partly sunny, with a high near 41. Calm wind becoming north around 5 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 24. Wind chill values between 15 and 20. Light west wind becoming northwest 6 to 11 mph in the evening. Winds could gust as high as 23 mph.
Monday
Mostly sunny, with a high near 32. North wind 10 to 15 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 17.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 47.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 33.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 43.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 26.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 38.
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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:
7:42 am EST Dec 6, 2025
Forecast Valid:
10am EST Dec 6, 2025-6pm EST Dec 12, 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