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.

Fog/Mist

36°F

2°C

Humidity 93%
Wind Speed NW 6 mph
Barometer 30.26 in (1024.8 mb)
Dewpoint 34°F (1°C)
Visibility 4.00 mi
Wind Chill31°F (-1°C)
Last update 4 Mar 7:56 am EST
Extended Forecast for

Belle Terre NY

  • Today

    Today: Patchy fog before 9am. Otherwise, partly sunny, with a high near 42. West wind around 5 mph becoming calm in the morning.

    High: 42 °F

    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: A 20 percent chance of rain after 4am. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Patchy Fog
    then Slight
    Chance Rain
    and Patchy
    Fog

  • Thursday

    Thursday: Rain, mainly after 7am. Patchy fog before 10am. High near 39. Calm wind becoming northeast 5 to 9 mph in the morning. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 39 °F

    Rain and
    Patchy Fog

  • Thursday Night

    Thursday Night: Rain. Low around 37. Northeast wind 11 to 18 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 37 °F

    Rain

  • Friday

    Friday: A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 40. Northeast wind 9 to 16 mph.

    High: 40 °F

    Chance Rain

  • Friday Night

    Friday Night: Cloudy, with a low around 37.

    Low: 37 °F

    Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 49.

    High: 49 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Showers likely, mainly before 1am. Cloudy, with a low around 44. Chance of precipitation is 60%.

    Low: 44 °F

    Showers
    Likely

  • Sunday

    Sunday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, partly sunny, with a high near 42. West wind around 5 mph becoming calm in the morning.
Tonight
A 20 percent chance of rain after 4am. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 34. Calm wind.
Thursday
Rain, mainly after 7am. Patchy fog before 10am. High near 39. Calm wind becoming northeast 5 to 9 mph in the morning. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain. Low around 37. Northeast wind 11 to 18 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 40. Northeast wind 9 to 16 mph.
Friday Night
Cloudy, with a low around 37.
Saturday
Mostly cloudy, with a high near 49.
Saturday Night
Showers likely, mainly before 1am. Cloudy, with a low around 44. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 51.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Sunny, with a high near 54.
Monday Night
Mostly clear, with a low around 44.
Tuesday
Mostly sunny, with a high near 54.
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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:
6:26 am EST Mar 4, 2026
Forecast Valid:
8am EST Mar 4, 2026-6pm EDT Mar 10, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation