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

21°F

-6°C

Humidity 47%
Wind Speed N 7 mph
Barometer 30.27 in (1025.2 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 9 Dec 6:56 am EST
Extended Forecast for

Belle Terre NY

  • Today

    Today: Increasing clouds, with a high near 36. Wind chill values between 15 and 25. North wind 5 to 9 mph becoming south in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of snow before 10pm. Mostly cloudy, with a temperature rising to around 38 by 11pm. Breezy, with a southwest wind 14 to 20 mph.

    Low: 34 °F⇑

    Breezy.
    Slight Chance
    Snow then
    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 47. Breezy, with a southwest wind 18 to 25 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 47 °F

    Breezy.
    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 35. Breezy, with a southwest wind 21 to 24 mph.

    Low: 35 °F

    Chance Rain
    and Breezy

  • Thursday

    Thursday: Mostly sunny, with a high near 39. Breezy, with a west wind 22 to 25 mph.

    High: 39 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 31. Windy.

    Low: 31 °F

    Partly Cloudy
    and Windy

  • Friday

    Friday: Mostly sunny, with a high near 37. Breezy.

    High: 37 °F

    Mostly Sunny
    and Breezy
    then Mostly
    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance Snow

  • Saturday

    Saturday: Partly sunny, with a high near 40. Breezy.

    High: 40 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

Detailed Forecast

Today
Increasing clouds, with a high near 36. Wind chill values between 15 and 25. North wind 5 to 9 mph becoming south in the afternoon.
Tonight
A 20 percent chance of snow before 10pm. Mostly cloudy, with a temperature rising to around 38 by 11pm. Breezy, with a southwest wind 14 to 20 mph.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 47. Breezy, with a southwest wind 18 to 25 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 35. Breezy, with a southwest wind 21 to 24 mph.
Thursday
Mostly sunny, with a high near 39. Breezy, with a west wind 22 to 25 mph.
Thursday Night
Partly cloudy, with a low around 31. Windy.
Friday
Mostly sunny, with a high near 37. Breezy.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 33.
Saturday
Partly sunny, with a high near 40. Breezy.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 31. Breezy.
Sunday
A 30 percent chance of snow. Partly sunny, with a high near 34. Breezy.
Sunday Night
Partly cloudy, with a low around 23. Blustery.
Monday
Mostly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Belle Terre NY
 40.96°N 73.08°W (Elev. 3 ft)
Last Update:
5:28 am EST Dec 9, 2025
Forecast Valid:
7am EST Dec 9, 2025-6pm EST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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