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.

Mostly Cloudy

32°F

0°C

Humidity 52%
Wind Speed W 12 mph
Barometer 30.10 in (1019.3 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 4 Jan 5:56 pm EST
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Partly cloudy, with a low around 21. Northwest wind 3 to 7 mph.

    Low: 21 °F

    Partly Cloudy

  • Monday

    Monday: A slight chance of light snow between 10am and 4pm. Increasing clouds, with a high near 36. Wind chill values between 20 and 30. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.

    High: 36 °F

    Slight Chance
    Light Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 42. Calm wind becoming east around 6 mph in the afternoon.

    High: 42 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of light rain. Mostly cloudy, with a low around 35. Calm wind becoming southwest around 5 mph after midnight.

    Low: 35 °F

    Chance Light
    Rain

  • Wednesday

    Wednesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 21. Northwest wind 3 to 7 mph.
Monday
A slight chance of light snow between 10am and 4pm. Increasing clouds, with a high near 36. Wind chill values between 20 and 30. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 29. Calm wind.
Tuesday
Cloudy, with a high near 42. Calm wind becoming east around 6 mph in the afternoon.
Tuesday Night
A 40 percent chance of light rain. Mostly cloudy, with a low around 35. Calm wind becoming southwest around 5 mph after midnight.
Wednesday
Mostly sunny, with a high near 48.
Wednesday Night
Mostly clear, with a low around 31.
Thursday
Mostly sunny, with a high near 45.
Thursday Night
Mostly cloudy, with a low around 35.
Friday
A 50 percent chance of rain. Cloudy, with a high near 48.
Friday Night
Rain likely. Cloudy, with a low around 39. Chance of precipitation is 60%.
Saturday
Rain likely. Mostly cloudy, with a high near 49. Chance of precipitation is 60%.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 31.
Sunday
Mostly sunny, with a high near 41.
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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:
3:08 pm EST Jan 4, 2026
Forecast Valid:
6pm EST Jan 4, 2026-6pm EST Jan 11, 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