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.

A Few Clouds

46°F

8°C

Humidity 79%
Wind Speed Calm
Barometer 30.01 in (1016.0 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 18 Oct 6:56 am EDT
Extended Forecast for

Belle Terre NY

  • Today

    Today: Sunny, with a high near 62. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 62 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 55. South wind around 6 mph.

    Low: 55 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 68. South wind 7 to 16 mph, with gusts as high as 28 mph.

    High: 68 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Showers, with thunderstorms also possible after 5am. Steady temperature around 66. Windy, with a south wind 18 to 26 mph, with gusts as high as 40 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Chance
    Showers and
    Breezy then
    Showers and
    Windy

  • Monday

    Monday: Showers and possibly a thunderstorm before 11am, then a chance of showers. High near 66. Windy, with a southeast wind 21 to 26 mph becoming southwest in the afternoon. Winds could gust as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 66 °F

    Showers and
    Windy then
    Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 55. Breezy.

    Low: 55 °F

    Partly Cloudy
    and Breezy

  • Tuesday

    Tuesday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A 40 percent chance of showers before 2pm. Partly sunny, with a high near 62.

    High: 62 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 62. North wind 5 to 7 mph becoming calm in the afternoon.
Tonight
Mostly clear, with a low around 55. South wind around 6 mph.
Sunday
Mostly sunny, with a high near 68. South wind 7 to 16 mph, with gusts as high as 28 mph.
Sunday Night
Showers, with thunderstorms also possible after 5am. Steady temperature around 66. Windy, with a south wind 18 to 26 mph, with gusts as high as 40 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm before 11am, then a chance of showers. High near 66. Windy, with a southeast wind 21 to 26 mph becoming southwest in the afternoon. Winds could gust as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday Night
Partly cloudy, with a low around 55. Breezy.
Tuesday
Sunny, with a high near 65.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 57.
Wednesday
A 40 percent chance of showers before 2pm. Partly sunny, with a high near 62.
Wednesday Night
Mostly clear, with a low around 52.
Thursday
Mostly sunny, with a high near 60.
Thursday Night
Partly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 59.
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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:
7:17 am EDT Oct 18, 2025
Forecast Valid:
7am EDT Oct 18, 2025-6pm EDT Oct 24, 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