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 51%
Wind Speed NW 13 mph
Barometer 30.02 in (1016.7 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 3 Dec 12:56 pm EST
Extended Forecast for

Belle Terre NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 40. Northwest wind 6 to 10 mph.

    High: 40 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 35. West wind 6 to 15 mph.

    Low: 35 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 40. Wind chill values between 25 and 30. Windy, with a west wind 16 to 26 mph.

    High: 40 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Windy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 20. Wind chill values between 10 and 15. Windy, with a northwest wind 24 to 29 mph decreasing to 10 to 15 mph after midnight.

    Low: 20 °F

    Mostly Clear
    and Windy
    then Mostly
    Clear

  • Friday

    Friday: A 20 percent chance of light snow after 1pm. Increasing clouds, with a high near 34. North wind 6 to 8 mph becoming south in the afternoon.

    High: 34 °F

    Mostly Sunny
    then Slight
    Chance Light
    Snow

  • Friday Night

    Friday Night: A chance of snow before 10pm, then a chance of rain and snow between 10pm and 4am, then a chance of rain after 4am. Cloudy, with a low around 30. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 39.

    High: 39 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 40. Northwest wind 6 to 10 mph.
Tonight
Mostly clear, with a low around 35. West wind 6 to 15 mph.
Thursday
Increasing clouds, with a high near 40. Wind chill values between 25 and 30. Windy, with a west wind 16 to 26 mph.
Thursday Night
Mostly clear, with a low around 20. Wind chill values between 10 and 15. Windy, with a northwest wind 24 to 29 mph decreasing to 10 to 15 mph after midnight.
Friday
A 20 percent chance of light snow after 1pm. Increasing clouds, with a high near 34. North wind 6 to 8 mph becoming south in the afternoon.
Friday Night
A chance of snow before 10pm, then a chance of rain and snow between 10pm and 4am, then a chance of rain after 4am. Cloudy, with a low around 30. Chance of precipitation is 30%.
Saturday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 39.
Saturday Night
Partly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 41.
Sunday Night
Mostly cloudy, with a low around 27.
Monday
Mostly sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 23.
Tuesday
Mostly sunny, with a high near 36.
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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:
12:40 pm EST Dec 3, 2025
Forecast Valid:
1pm EST Dec 3, 2025-6pm EST Dec 9, 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