National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

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 55%
Wind Speed SW 12 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 22 Jan 5:56 am EST
Extended Forecast for

Belle Terre NY

  • Today

    Today: Increasing clouds, with a high near 41. West wind around 18 mph.

    High: 41 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. Wind chill values between 20 and 25. West wind 16 to 18 mph.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 34. Wind chill values between 15 and 20. Breezy, with a west wind 14 to 19 mph increasing to 20 to 25 mph in the afternoon.

    High: 34 °F

    Mostly Sunny
    then Partly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 12. Wind chill values between -5 and 5. Windy, with a northwest wind 21 to 28 mph.

    Low: 12 °F

    Partly Cloudy
    and Windy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 18. Northwest wind 13 to 18 mph.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: A 50 percent chance of snow after 1am. Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow. High near 25. Blustery. Chance of precipitation is 90%.

    High: 25 °F

    Snow and
    Blustery

  • Sunday Night

    Sunday Night: Snow. Low around 21. Windy. Chance of precipitation is 80%.

    Low: 21 °F

    Snow and
    Windy

  • Monday

    Monday: A 40 percent chance of snow. Mostly cloudy, with a high near 27. Blustery.

    High: 27 °F

    Chance Snow
    and Blustery

Detailed Forecast

Today
Increasing clouds, with a high near 41. West wind around 18 mph.
Tonight
Mostly cloudy, with a low around 30. Wind chill values between 20 and 25. West wind 16 to 18 mph.
Friday
Mostly sunny, with a high near 34. Wind chill values between 15 and 20. Breezy, with a west wind 14 to 19 mph increasing to 20 to 25 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 12. Wind chill values between -5 and 5. Windy, with a northwest wind 21 to 28 mph.
Saturday
Mostly sunny and cold, with a high near 18. Northwest wind 13 to 18 mph.
Saturday Night
A 50 percent chance of snow after 1am. Mostly cloudy, with a low around 14.
Sunday
Snow. High near 25. Blustery. Chance of precipitation is 90%.
Sunday Night
Snow. Low around 21. Windy. Chance of precipitation is 80%.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 27. Blustery.
Monday Night
Partly cloudy, with a low around 15. Blustery.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
Partly cloudy, with a low around 18. Breezy.
Wednesday
Partly sunny, with a high near 27.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Belle Terre NY
 40.96°N 73.08°W (Elev. 3 ft)
Last Update:
1:01 am EST Jan 22, 2026
Forecast Valid:
6am EST Jan 22, 2026-6pm EST Jan 28, 2026
 
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