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.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Belle Terre NY
 40.96°N 73.08°W (Elev. 3 ft)
5:39 pm EST Dec 7, 2025
6pm EST Dec 7, 2025-6pm EST Dec 14, 2025
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database