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.

Overcast

62°F

17°C

Humidity 90%
Wind Speed NE 15 G 22 mph
Barometer 30.05 in (1017.5 mb)
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Last update 14 Jun 10:56 am EDT
Extended Forecast for

Great River NY

  • Today

    Today: Showers likely before 2pm, then light rain likely after 2pm. Cloudy, with a high near 65. Northeast wind around 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 65 °F

    Showers
    Likely

  • Tonight

    Tonight: Light rain likely, mainly before 8pm. Cloudy, with a low around 57. Northeast wind 9 to 11 mph. Chance of precipitation is 60%.

    Low: 57 °F

    Light Rain
    Likely

  • Sunday

    Sunday: A 20 percent chance of light rain before 2pm. Mostly cloudy, with a high near 66. East wind 9 to 11 mph.

    High: 66 °F

    Slight Chance
    Light Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of light rain after 2am. Mostly cloudy, with a low around 59. East wind around 7 mph.

    Low: 59 °F

    Mostly Cloudy
    then Slight
    Chance Light
    Rain

  • Monday

    Monday: A 20 percent chance of light rain before 2pm. Mostly cloudy, with a high near 67. East wind 8 to 10 mph.

    High: 67 °F

    Slight Chance
    Light Rain

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 71.

    High: 71 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 62.

    Low: 62 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 76.

    High: 76 °F

    Mostly Cloudy

Detailed Forecast

Today
Showers likely before 2pm, then light rain likely after 2pm. Cloudy, with a high near 65. Northeast wind around 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Light rain likely, mainly before 8pm. Cloudy, with a low around 57. Northeast wind 9 to 11 mph. Chance of precipitation is 60%.
Sunday
A 20 percent chance of light rain before 2pm. Mostly cloudy, with a high near 66. East wind 9 to 11 mph.
Sunday Night
A 20 percent chance of light rain after 2am. Mostly cloudy, with a low around 59. East wind around 7 mph.
Monday
A 20 percent chance of light rain before 2pm. Mostly cloudy, with a high near 67. East wind 8 to 10 mph.
Monday Night
Mostly cloudy, with a low around 60.
Tuesday
Mostly cloudy, with a high near 71.
Tuesday Night
Mostly cloudy, with a low around 62.
Wednesday
Mostly cloudy, with a high near 76.
Wednesday Night
Mostly cloudy, with a low around 66.
Juneteenth
A 30 percent chance of showers. Partly sunny, with a high near 81.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 67.
Friday
Sunny, with a high near 79.
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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:
10:49 am EDT Jun 14, 2025
Forecast Valid:
11am EDT Jun 14, 2025-6pm EDT Jun 20, 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