National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

72°F

22°C

Humidity 87%
Wind Speed SW 8 mph
Barometer 29.89 in (1012.0 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 10 Sep 7:56 am EDT
Extended Forecast for

North Great River NY

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 86. West wind 9 to 11 mph.

    High: 86 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of showers after 2am. Partly cloudy, with a low around 66. Light and variable wind.

    Low: 66 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, then gradual clearing during the afternoon, with a high near 78. North wind 3 to 7 mph.

    High: 78 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60. Calm wind.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 77. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 77 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 50 percent chance of showers after 2am. Mostly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 50 percent chance of showers. Mostly cloudy, with a high near 79.

    High: 79 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 86. West wind 9 to 11 mph.
Tonight
A 20 percent chance of showers after 2am. Partly cloudy, with a low around 66. Light and variable wind.
Friday
Mostly cloudy, then gradual clearing during the afternoon, with a high near 78. North wind 3 to 7 mph.
Friday Night
Mostly clear, with a low around 60. Calm wind.
Saturday
Mostly sunny, with a high near 77. Light and variable wind becoming south 5 to 8 mph in the morning.
Saturday Night
A 50 percent chance of showers after 2am. Mostly cloudy, with a low around 66.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 79.
Sunday Night
Partly cloudy, with a low around 66.
Monday
Mostly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 65.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
A 30 percent chance of showers. Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
North Great River NY
 40.74°N 73.16°W (Elev. 7 ft)
Last Update:
8:26 am EDT Sep 10, 2026
Forecast Valid:
8am EDT Sep 10, 2026-6pm EDT Sep 16, 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