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.

Fair

53°F

12°C

Humidity 86%
Wind Speed E 3 mph
Barometer 30.42 in (1030.1 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 11 Oct 2:56 am EDT
Extended Forecast for

Belle Terre NY

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 59. Southeast wind around 8 mph.

    Low: 59 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, mainly after 8am. High near 65. East wind 13 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 65 °F

    Rain Likely
    then Rain

  • Sunday Night

    Sunday Night: Rain and possibly a thunderstorm before 2am, then a chance of rain and thunderstorms, mainly between 2am and 5am. Low around 59. Breezy, with an east wind 21 to 23 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 59 °F

    Breezy. Rain
    then Rain
    Likely

  • Columbus Day

    Columbus Day: A 30 percent chance of showers before 11am. Cloudy through mid morning, then gradual clearing, with a high near 68. North wind 13 to 18 mph decreasing to 7 to 12 mph in the afternoon.

    High: 68 °F

    Chance
    Showers then
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 59. Northwest wind 5 to 7 mph.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 59. Southeast wind around 8 mph.
Sunday
Rain, mainly after 8am. High near 65. East wind 13 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Rain and possibly a thunderstorm before 2am, then a chance of rain and thunderstorms, mainly between 2am and 5am. Low around 59. Breezy, with an east wind 21 to 23 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Columbus Day
A 30 percent chance of showers before 11am. Cloudy through mid morning, then gradual clearing, with a high near 68. North wind 13 to 18 mph decreasing to 7 to 12 mph in the afternoon.
Monday Night
Mostly clear, with a low around 59. Northwest wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 68.
Tuesday Night
Partly cloudy, with a low around 63.
Wednesday
Sunny, with a high near 71.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 52.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 65.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 52. Breezy.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 60. Breezy.
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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:
2:27 am EDT Oct 11, 2026
Forecast Valid:
3am EDT Oct 11, 2026-6pm EDT Oct 17, 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