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.

Light Rain Fog/Mist

42°F

6°C

Humidity 89%
Wind Speed N 14 G 22 mph
Barometer 29.56 in (1000.9 mb)
Dewpoint 39°F (4°C)
Visibility 6.00 mi
Wind Chill35°F (2°C)
Last update 13 Nov 10:56 am EST
Extended Forecast for

Great River NY

Coastal Flood Advisory until November 13, 03:00pm
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory until November 13, 03:00pm

    NOW until 3:00pm Fri

    Coastal Flood Advisory

  • Today

    High: 48 °F⇓

    Rain and
    Breezy

  • Tonight

    Tonight: Rain likely, mainly before 7pm. Cloudy, with a low around 38. North wind around 14 mph. Chance of precipitation is 60%.

    Low: 38 °F

    Rain Likely
    then Mostly
    Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 48. Northwest wind 13 to 16 mph.

    High: 48 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 39. Northwest wind around 15 mph.

    Low: 39 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50. Northwest wind 14 to 16 mph.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Today
Rain. Temperature falling to around 44 by 5pm. Breezy, with a north wind 17 to 22 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain likely, mainly before 7pm. Cloudy, with a low around 38. North wind around 14 mph. Chance of precipitation is 60%.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 48. Northwest wind 13 to 16 mph.
Saturday Night
Partly cloudy, with a low around 39. Northwest wind around 15 mph.
Sunday
Mostly sunny, with a high near 50. Northwest wind 14 to 16 mph.
Sunday Night
Mostly clear, with a low around 39.
Monday
Sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 38.
Tuesday
Sunny, with a high near 54.
Tuesday Night
Mostly clear, with a low around 41.
Wednesday
Sunny, with a high near 57.
Wednesday Night
Clear, with a low around 43.
Thursday
Sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Great River NY
 40.7°N 73.17°W (Elev. 7 ft)
Last Update:
5:44 am EST Nov 13, 2026
Forecast Valid:
11am EST Nov 13, 2026-6pm EST Nov 19, 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