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.

Fair

34°F

1°C

Humidity 64%
Wind Speed E 6 mph
Barometer 30.22 in (1023.3 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 2 Dec 1:56 am EST
Extended Forecast for

Belle Terre NY

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 38. East wind around 8 mph.

    Low: 38 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Rain, mainly after 10am. High near 46. Southeast wind 10 to 18 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    High: 46 °F

    Rain

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain before 10pm. Cloudy, then gradually becoming partly cloudy, with a low around 34. Breezy, with a northwest wind around 25 mph.

    Low: 34 °F

    Breezy.
    Chance Rain
    then
    Decreasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 40. Wind chill values between 25 and 35. Northwest wind 9 to 18 mph.

    High: 40 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 35. West wind 9 to 17 mph.

    Low: 35 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 41. Breezy.

    High: 41 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 18. Blustery.

    Low: 18 °F

    Mostly Clear
    and Blustery

  • Friday

    Friday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of light snow after 4am. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Light Snow

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 38. East wind around 8 mph.
Tuesday
Rain, mainly after 10am. High near 46. Southeast wind 10 to 18 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Tuesday Night
A 40 percent chance of rain before 10pm. Cloudy, then gradually becoming partly cloudy, with a low around 34. Breezy, with a northwest wind around 25 mph.
Wednesday
Sunny, with a high near 40. Wind chill values between 25 and 35. Northwest wind 9 to 18 mph.
Wednesday Night
Partly cloudy, with a low around 35. West wind 9 to 17 mph.
Thursday
Partly sunny, with a high near 41. Breezy.
Thursday Night
Mostly clear, with a low around 18. Blustery.
Friday
Mostly sunny, with a high near 36.
Friday Night
A 30 percent chance of light snow after 4am. Mostly cloudy, with a low around 26.
Saturday
A 30 percent chance of light snow before 10am. Partly sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Partly sunny, with a high near 40.
Sunday Night
Mostly cloudy, with a low around 22.
Monday
Mostly sunny, with a high near 31.
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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:
1:30 am EST Dec 2, 2025
Forecast Valid:
2am EST Dec 2, 2025-6pm EST Dec 8, 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