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.

A Few Clouds

34°F

1°C

Humidity 100%
Wind Speed Calm
Barometer 30.03 in (1017.1 mb)
Dewpoint 34°F (1°C)
Visibility 9.00 mi
Last update 28 Feb 9:56 pm EST
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Areas of fog between 11pm and 2am. Otherwise, mostly cloudy, with a low around 27. Light and variable wind.

    Low: 27 °F

    Areas Fog

  • Sunday

    Sunday: Snow likely, mainly before 1pm. Cloudy, with a high near 35. Wind chill values between 25 and 30. Light north wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 35 °F

    Snow Likely

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 14. Wind chill values between 5 and 10. North wind around 7 mph.

    Low: 14 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 28. Wind chill values between 5 and 15. North wind around 6 mph becoming calm in the afternoon.

    High: 28 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18. Calm wind.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 41. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 41 °F

    Chance
    Rain/Snow
    then Rain
    Likely

  • Tuesday Night

    Tuesday Night: Rain. Low around 35. Chance of precipitation is 90%.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain

Detailed Forecast

Tonight
Areas of fog between 11pm and 2am. Otherwise, mostly cloudy, with a low around 27. Light and variable wind.
Sunday
Snow likely, mainly before 1pm. Cloudy, with a high near 35. Wind chill values between 25 and 30. Light north wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly clear, with a low around 14. Wind chill values between 5 and 10. North wind around 7 mph.
Monday
Sunny, with a high near 28. Wind chill values between 5 and 15. North wind around 6 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 18. Calm wind.
Tuesday
A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 41. Chance of precipitation is 70%. Little or no snow accumulation expected.
Tuesday Night
Rain. Low around 35. Chance of precipitation is 90%.
Wednesday
Mostly cloudy, with a high near 46.
Wednesday Night
A 40 percent chance of rain. Cloudy, with a low around 34.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 49.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 37.
Friday
A 40 percent chance of rain. Cloudy, with a high near 46.
Friday Night
A 30 percent chance of rain. Cloudy, with a low around 36.
Saturday
Mostly cloudy, with a high near 51.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Grove NY
 40.85°N 73.1°W (Elev. 144 ft)
Last Update:
6:27 pm EST Feb 28, 2026
Forecast Valid:
10pm EST Feb 28, 2026-6pm EST Mar 7, 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