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

41°F

5°C

Humidity 57%
Wind Speed SW 8 mph
Barometer 30.02 in (1016.7 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 7 Dec 5:56 pm EST
Extended Forecast for

Belle Terre NY

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 27. West wind 9 to 17 mph becoming northwest after midnight.

    Low: 27 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 30. Wind chill values between 15 and 20. Blustery, with a north wind 15 to 23 mph.

    High: 30 °F

    Mostly Sunny
    and Blustery
    then Partly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. North wind 7 to 14 mph.

    Low: 19 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 41. Wind chill values between 15 and 25. Northeast wind 5 to 13 mph becoming south in the afternoon.

    High: 41 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 37. Breezy, with a southwest wind 18 to 21 mph.

    Low: 37 °F

    Slight Chance
    Rain and
    Breezy

  • Wednesday

    Wednesday: A 50 percent chance of rain. Mostly cloudy, with a high near 47.

    High: 47 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 39. Breezy.

    Low: 39 °F

    Chance Rain
    and Breezy

  • Thursday

    Thursday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 27. West wind 9 to 17 mph becoming northwest after midnight.
Monday
Mostly sunny, with a high near 30. Wind chill values between 15 and 20. Blustery, with a north wind 15 to 23 mph.
Monday Night
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. North wind 7 to 14 mph.
Tuesday
Increasing clouds, with a high near 41. Wind chill values between 15 and 25. Northeast wind 5 to 13 mph becoming south in the afternoon.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 37. Breezy, with a southwest wind 18 to 21 mph.
Wednesday
A 50 percent chance of rain. Mostly cloudy, with a high near 47.
Wednesday Night
A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 39. Breezy.
Thursday
Mostly sunny, with a high near 42.
Thursday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 33.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 38.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 30%.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 35. Breezy.
Saturday Night
Partly cloudy, with a low around 26. Blustery.
Sunday
Mostly sunny, with a high near 33. Breezy.
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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:
5:39 pm EST Dec 7, 2025
Forecast Valid:
6pm EST Dec 7, 2025-6pm EST Dec 14, 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