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.

A Few Clouds

52°F

11°C

Humidity 57%
Wind Speed NW 13 mph
Barometer 29.94 in (1013.6 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 9 Nov 7:56 pm EST
Extended Forecast for

North Great River NY

  • Tonight

    Tonight: Mostly clear, with a low around 37. Northwest wind 6 to 9 mph.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 60. Southwest wind 7 to 11 mph, with gusts as high as 23 mph.

    High: 60 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42. West wind around 7 mph.

    Low: 42 °F

    Mostly Clear

  • Veterans Day

    Veterans Day: Mostly sunny, with a high near 59. West wind 3 to 7 mph.

    High: 59 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 42. Light and variable wind.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of rain after 1pm. Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 37. Chance of precipitation is 80%.

    Low: 37 °F

    Rain

  • Friday

    Friday: Rain likely. Mostly cloudy, with a high near 49. Chance of precipitation is 70%.

    High: 49 °F

    Rain Likely

  • Friday Night

    Friday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 37. Northwest wind 6 to 9 mph.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 60. Southwest wind 7 to 11 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 42. West wind around 7 mph.
Veterans Day
Mostly sunny, with a high near 59. West wind 3 to 7 mph.
Wednesday Night
Mostly cloudy, with a low around 42. Light and variable wind.
Thursday
A 50 percent chance of rain after 1pm. Mostly cloudy, with a high near 60.
Thursday Night
Rain. Low around 37. Chance of precipitation is 80%.
Friday
Rain likely. Mostly cloudy, with a high near 49. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 33.
Saturday
Mostly cloudy, with a high near 48.
Saturday Night
Mostly cloudy, with a low around 33.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 33.
Monday
Mostly sunny, with a high near 53.
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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:
1:27 pm EST Nov 9, 2026
Forecast Valid:
8pm EST Nov 9, 2026-6pm EST Nov 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