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.

Mostly Cloudy

77°F

25°C

Humidity 74%
Wind Speed S 14 G 20 mph
Barometer 30.07 in (1018.1 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 27 Aug 9:56 am EDT
Extended Forecast for

Belle Terre NY

  • Today

    Today: A slight chance of showers and thunderstorms between 2pm and 5pm. Partly sunny, with a high near 79. South wind 11 to 14 mph. Chance of precipitation is 20%.

    High: 79 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 11pm and 2am. Increasing clouds, with a low around 71. South wind 6 to 11 mph.

    Low: 71 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 11am, then a chance of showers and thunderstorms after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 79. Light west wind. Chance of precipitation is 40%.

    High: 79 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 69. Light and variable wind becoming north around 6 mph after midnight.

    Low: 69 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 78. North wind 5 to 8 mph becoming calm in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms between 2pm and 5pm. Partly sunny, with a high near 79. South wind 11 to 14 mph. Chance of precipitation is 20%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 11pm and 2am. Increasing clouds, with a low around 71. South wind 6 to 11 mph.
Friday
A slight chance of showers before 11am, then a chance of showers and thunderstorms after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 79. Light west wind. Chance of precipitation is 40%.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 69. Light and variable wind becoming north around 6 mph after midnight.
Saturday
Mostly sunny, with a high near 78. North wind 5 to 8 mph becoming calm in the afternoon.
Saturday Night
Mostly clear, with a low around 69.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 71.
Monday
Partly sunny, with a high near 81.
Monday Night
Mostly cloudy, with a low around 70.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 79.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 69.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Belle Terre NY
 40.96°N 73.08°W (Elev. 3 ft)
Last Update:
8:44 am EDT Aug 27, 2026
Forecast Valid:
10am EDT Aug 27, 2026-6pm EDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

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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