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

30°F

-1°C

Humidity 51%
Wind Speed N 13 mph
Barometer 30.00 in (1016.1 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 12 Feb 7:56 pm EST
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 18. Northwest wind around 6 mph.

    Low: 18 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 33. Wind chill values between 10 and 20. Northwest wind 5 to 8 mph.

    High: 33 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow showers after 1am. Increasing clouds, with a low around 22. Calm wind becoming west around 5 mph after midnight.

    Low: 22 °F

    Partly Cloudy
    then Chance
    Snow Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 39. Wind chill values between 20 and 30. West wind 6 to 9 mph.

    High: 39 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 23. Light west wind.

    Low: 23 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Chance Snow

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 18. Northwest wind around 6 mph.
Friday
Sunny, with a high near 33. Wind chill values between 10 and 20. Northwest wind 5 to 8 mph.
Friday Night
A 30 percent chance of snow showers after 1am. Increasing clouds, with a low around 22. Calm wind becoming west around 5 mph after midnight.
Saturday
Mostly sunny, with a high near 39. Wind chill values between 20 and 30. West wind 6 to 9 mph.
Saturday Night
Mostly clear, with a low around 23. Light west wind.
Sunday
Partly sunny, with a high near 36.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 27.
Washington's Birthday
Partly sunny, with a high near 40.
Monday Night
Mostly cloudy, with a low around 31.
Tuesday
Partly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 50 percent chance of rain. Cloudy, with a high near 44.
Wednesday Night
Rain likely. Cloudy, with a low around 33. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 44.
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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:
3:41 pm EST Feb 12, 2026
Forecast Valid:
8pm EST Feb 12, 2026-6pm EST Feb 19, 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