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.

Mostly Cloudy

73°F

23°C

Humidity 59%
Wind Speed SE 9 mph
Barometer 30.16 in (1021.1 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 18 Aug 4:56 pm EDT
Extended Forecast for

North Great River NY

  • Tonight

    Tonight: Mostly clear, with a low around 58. East wind 7 to 10 mph.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75. East wind 9 to 13 mph.

    High: 75 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 60. East wind 5 to 7 mph.

    Low: 60 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers after 2pm. Partly sunny, with a high near 76. East wind 8 to 11 mph, with gusts as high as 21 mph.

    High: 76 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before 2am. Partly cloudy, with a low around 63. East wind around 9 mph.

    Low: 63 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 58. East wind 7 to 10 mph.
Tuesday
Mostly sunny, with a high near 75. East wind 9 to 13 mph.
Tuesday Night
Partly cloudy, with a low around 60. East wind 5 to 7 mph.
Wednesday
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 76. East wind 8 to 11 mph, with gusts as high as 21 mph.
Wednesday Night
A 20 percent chance of showers before 2am. Partly cloudy, with a low around 63. East wind around 9 mph.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 62.
Friday
Sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 81.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 66.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
North Great River NY
 40.77°N 73.15°W (Elev. 30 ft)
Last Update:
2:53 pm EDT Aug 18, 2025
Forecast Valid:
5pm EDT Aug 18, 2025-6pm EDT Aug 25, 2025
 
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