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Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Light Drizzle Fog

49°F

9°C

Humidity 97%
Wind Speed SE 9 mph
Barometer 29.52 in (999.5 mb)
Dewpoint 48°F (9°C)
Visibility 0.50 mi
Wind Chill45°F (7°C)
Last update 20 Mar 11:56 pm EDT
Extended Forecast for

Great River NY

  • Overnight

    Overnight: Showers, mainly before 4am. Areas of fog before 2am. Steady temperature around 45. West wind 5 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Showers and
    Areas Fog

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 55. Windy, with a northwest wind 20 to 26 mph, with gusts as high as 38 mph.

    High: 55 °F

    Becoming
    Sunny and
    Windy

  • Friday Night

    Friday Night: Mostly clear, with a low around 32. Southwest wind 5 to 11 mph.

    Low: 32 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, with a high near 54. Southwest wind 8 to 15 mph.

    High: 54 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 31. West wind 11 to 14 mph.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 46.

    High: 46 °F

    Sunny

  • Sunday Night

    Sunday Night: Rain likely, mainly after 5am. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.

    Low: 39 °F

    Mostly Cloudy
    then Rain
    Likely

  • Monday

    Monday: Rain. High near 53. Chance of precipitation is 80%.

    High: 53 °F

    Rain

  • Monday Night

    Monday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance
    Showers

Detailed Forecast

Overnight
Showers, mainly before 4am. Areas of fog before 2am. Steady temperature around 45. West wind 5 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 55. Windy, with a northwest wind 20 to 26 mph, with gusts as high as 38 mph.
Friday Night
Mostly clear, with a low around 32. Southwest wind 5 to 11 mph.
Saturday
Partly sunny, with a high near 54. Southwest wind 8 to 15 mph.
Saturday Night
Mostly clear, with a low around 31. West wind 11 to 14 mph.
Sunday
Sunny, with a high near 46.
Sunday Night
Rain likely, mainly after 5am. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.
Monday
Rain. High near 53. Chance of precipitation is 80%.
Monday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 40.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Partly cloudy, with a low around 37.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 50.
Wednesday Night
Mostly cloudy, with a low around 37.
Thursday
Mostly sunny, with a high near 51.
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Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Great River NY
 40.72°N 73.16°W (Elev. 13 ft)
Last Update:
1:08 am EDT Mar 21, 2025
Forecast Valid:
1am EDT Mar 21, 2025-6pm EDT Mar 27, 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