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.

Overcast

43°F

6°C

Humidity 76%
Wind Speed NW 6 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 6 Dec 11:56 am EST
Extended Forecast for

Belle Terre NY

  • This Afternoon

    This Afternoon: A slight chance of drizzle before 1pm. Mostly cloudy, with a high near 41. West wind 7 to 9 mph.

    High: 41 °F

    Slight Chance
    Drizzle

  • Tonight

    Tonight: Partly cloudy, with a low around 35. West wind 8 to 11 mph.

    Low: 35 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 40. North wind around 6 mph becoming southwest in the afternoon.

    High: 40 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 29. Wind chill values between 20 and 25. Blustery, with a southwest wind 8 to 13 mph becoming northwest 20 to 25 mph after midnight.

    Low: 29 °F

    Mostly Cloudy
    then Partly
    Cloudy and
    Blustery

  • Monday

    Monday: Mostly sunny, with a temperature falling to around 28 by 5pm. Windy, with a north wind 18 to 28 mph.

    High: 32 °F⇓

    Mostly Sunny
    and Windy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23.

    Low: 23 °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 37.

    Low: 37 °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

This Afternoon
A slight chance of drizzle before 1pm. Mostly cloudy, with a high near 41. West wind 7 to 9 mph.
Tonight
Partly cloudy, with a low around 35. West wind 8 to 11 mph.
Sunday
Partly sunny, with a high near 40. North wind around 6 mph becoming southwest in the afternoon.
Sunday Night
Mostly cloudy, with a low around 29. Wind chill values between 20 and 25. Blustery, with a southwest wind 8 to 13 mph becoming northwest 20 to 25 mph after midnight.
Monday
Mostly sunny, with a temperature falling to around 28 by 5pm. Windy, with a north wind 18 to 28 mph.
Monday Night
Partly cloudy, with a low around 23.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
Mostly cloudy, with a low around 37.
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 39. Breezy.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 42.
Thursday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Friday
A chance of rain and snow. Partly sunny, with a high near 37. Breezy. Chance of precipitation is 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:
7:42 am EST Dec 6, 2025
Forecast Valid:
12pm EST Dec 6, 2025-6pm EST Dec 12, 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