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.

Light Rain

N/A

Humidity NA
Wind Speed NW 5 mph
Barometer 29.69 in
Dewpoint N/A
Visibility 4.00 mi
Last update 11 Jan 12:56 am EST
Extended Forecast for

North Great River NY

  • Overnight

    Overnight: Rain likely, mainly before 4am. Patchy fog. Otherwise, cloudy, with a low around 40. West wind 6 to 9 mph. Chance of precipitation is 60%.

    Low: 40 °F

    Rain Likely
    and Patchy
    Fog

  • Sunday

    Sunday: A chance of rain before 10am, then a chance of snow showers after 4pm. Areas of fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 46. West wind 7 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    High: 46 °F

    Chance Rain
    and Areas Fog
    then Chance
    Snow Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers, mainly before 7pm. Partly cloudy, with a low around 28. Wind chill values between 15 and 20. West wind 14 to 18 mph, with gusts as high as 31 mph.

    Low: 28 °F

    Chance Snow
    Showers then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 41. Wind chill values between 20 and 30. West wind 9 to 11 mph, with gusts as high as 26 mph.

    High: 41 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 31. West wind around 7 mph.

    Low: 31 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 45.

    High: 45 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 46.

    High: 46 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Chance Rain

Detailed Forecast

Overnight
Rain likely, mainly before 4am. Patchy fog. Otherwise, cloudy, with a low around 40. West wind 6 to 9 mph. Chance of precipitation is 60%.
Sunday
A chance of rain before 10am, then a chance of snow showers after 4pm. Areas of fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 46. West wind 7 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Sunday Night
A 30 percent chance of snow showers, mainly before 7pm. Partly cloudy, with a low around 28. Wind chill values between 15 and 20. West wind 14 to 18 mph, with gusts as high as 31 mph.
Monday
Sunny, with a high near 41. Wind chill values between 20 and 30. West wind 9 to 11 mph, with gusts as high as 26 mph.
Monday Night
Mostly clear, with a low around 31. West wind around 7 mph.
Tuesday
Sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Cloudy, with a high near 46.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 38.
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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:
8:12 pm EST Jan 10, 2026
Forecast Valid:
1am EST Jan 11, 2026-6pm EST Jan 17, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation