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.

Partly Cloudy

79°F

26°C

Humidity 67%
Wind Speed N 7 mph
Barometer 29.85 in (1010.6 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 13 Aug 10:56 am EDT
Extended Forecast for

Belle Terre NY

  • Today

    Today: A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 81. Northwest wind around 11 mph, with gusts as high as 21 mph.

    High: 81 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 70. Northwest wind around 8 mph.

    Low: 70 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 81. Northwest wind around 7 mph becoming west in the afternoon.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers before 2am. Partly cloudy, with a low around 70. Light and variable wind becoming north 5 to 10 mph after midnight. Winds could gust as high as 20 mph.

    Low: 70 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 80. North wind 9 to 14 mph becoming light and variable in the afternoon.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Sunday

    Sunday: A 40 percent chance of showers after 2pm. Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Showers, mainly after 8pm. Low around 71. Chance of precipitation is 80%.

    Low: 71 °F

    Showers

  • Monday

    Monday: Showers likely before 8am. Partly sunny, with a high near 83. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely then
    Mostly Sunny

Detailed Forecast

Today
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 81. Northwest wind around 11 mph, with gusts as high as 21 mph.
Tonight
Partly cloudy, with a low around 70. Northwest wind around 8 mph.
Friday
Sunny, with a high near 81. Northwest wind around 7 mph becoming west in the afternoon.
Friday Night
A 20 percent chance of showers before 2am. Partly cloudy, with a low around 70. Light and variable wind becoming north 5 to 10 mph after midnight. Winds could gust as high as 20 mph.
Saturday
Sunny, with a high near 80. North wind 9 to 14 mph becoming light and variable in the afternoon.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
A 40 percent chance of showers after 2pm. Partly sunny, with a high near 80.
Sunday Night
Showers, mainly after 8pm. Low around 71. Chance of precipitation is 80%.
Monday
Showers likely before 8am. Partly sunny, with a high near 83. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 69.
Wednesday
Sunny, with a high near 82.
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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:
4:30 am EDT Aug 13, 2026
Forecast Valid:
11am EDT Aug 13, 2026-6pm EDT Aug 19, 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