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

37°F

3°C

Humidity 86%
Wind Speed E 5 mph
Barometer 29.91 in (1012.9 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 6 Dec 4:56 am EST
Extended Forecast for

Great River NY

  • Overnight

    Overnight: A chance of drizzle. Cloudy, with a steady temperature around 35. Calm wind.

    Low: 35 °F

    Chance
    Drizzle

  • Saturday

    Saturday: A chance of drizzle before 10am. Mostly cloudy, with a high near 42. Calm wind becoming west 5 to 8 mph in the morning.

    High: 42 °F

    Chance
    Drizzle then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. West wind around 7 mph.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 42. Wind chill values between 25 and 35. Northwest wind 5 to 7 mph becoming southwest in the afternoon.

    High: 42 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 25. Northwest wind 6 to 14 mph, with gusts as high as 25 mph.

    Low: 25 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A chance of drizzle. Cloudy, with a steady temperature around 35. Calm wind.
Saturday
A chance of drizzle before 10am. Mostly cloudy, with a high near 42. Calm wind becoming west 5 to 8 mph in the morning.
Saturday Night
Partly cloudy, with a low around 29. West wind around 7 mph.
Sunday
Partly sunny, with a high near 42. Wind chill values between 25 and 35. Northwest wind 5 to 7 mph becoming southwest in the afternoon.
Sunday Night
Mostly cloudy, with a low around 25. Northwest wind 6 to 14 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 33.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Partly sunny, with a high near 40.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 48.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 35.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 43.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 27.
Friday
A chance of rain and snow. Partly sunny, with a high near 39. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Great River NY
 40.72°N 73.16°W (Elev. 13 ft)
Last Update:
12:53 am EST Dec 6, 2025
Forecast Valid:
5am EST Dec 6, 2025-6pm EST Dec 12, 2025
 
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Additional Resources

Radar & Satellite Image

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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