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 and Breezy

64°F

18°C

Humidity 26%
Wind Speed N 21 G 37 mph
Barometer 30.22 in (1023.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 20 Apr 12:56 pm EDT
Extended Forecast for

North Great River NY

  • This Afternoon

    This Afternoon: Sunny, with a steady temperature around 64. Northwest wind 16 to 18 mph, with gusts as high as 31 mph.

    High: 64 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 40. North wind around 5 mph becoming calm in the evening.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Increasing clouds, with a high near 56. East wind 5 to 11 mph becoming south in the afternoon.

    High: 56 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Showers likely, mainly after 2am. Cloudy, with a low around 48. South wind around 11 mph. Chance of precipitation is 70%.

    Low: 48 °F

    Chance
    Showers then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before 8am. Partly sunny, with a high near 74. West wind 7 to 14 mph. Chance of precipitation is 60%.

    High: 74 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 64. Northwest wind 16 to 18 mph, with gusts as high as 31 mph.
Tonight
Partly cloudy, with a low around 40. North wind around 5 mph becoming calm in the evening.
Monday
Increasing clouds, with a high near 56. East wind 5 to 11 mph becoming south in the afternoon.
Monday Night
Showers likely, mainly after 2am. Cloudy, with a low around 48. South wind around 11 mph. Chance of precipitation is 70%.
Tuesday
Showers likely, mainly before 8am. Partly sunny, with a high near 74. West wind 7 to 14 mph. Chance of precipitation is 60%.
Tuesday Night
Mostly cloudy, with a low around 48.
Wednesday
Mostly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 47.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Partly sunny, with a high near 62.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 50.
Saturday
A 40 percent chance of showers. Mostly cloudy, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
North Great River NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
10:10 am EDT Apr 20, 2025
Forecast Valid:
1pm EDT Apr 20, 2025-6pm EDT Apr 26, 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