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

21°F

-6°C

Humidity 36%
Wind Speed W 15 mph
Barometer 30.30 in (1026.2 mb)
Dewpoint -2°F (-19°C)
Visibility 10.00 mi
Wind Chill7°F (-14°C)
Last update 20 Jan 3:56 pm EST
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Mostly clear, with a low around 11. Wind chill values between 5 and 10. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 11 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 38. Wind chill values between 5 and 15. Light west wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 21 mph.

    High: 38 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: A slight chance of rain and snow before 1am, then a slight chance of snow between 1am and 4am, then a slight chance of rain after 4am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 35. Southwest wind 7 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    Low: 35 °F

    Slight Chance
    Rain/Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 43. West wind 8 to 14 mph, with gusts as high as 24 mph.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 24. West wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 24 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 9.

    Low: 9 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: A 40 percent chance of snow after 1am. Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 11. Wind chill values between 5 and 10. West wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Increasing clouds, with a high near 38. Wind chill values between 5 and 15. Light west wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 21 mph.
Wednesday Night
A slight chance of rain and snow before 1am, then a slight chance of snow between 1am and 4am, then a slight chance of rain after 4am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 35. Southwest wind 7 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 43. West wind 8 to 14 mph, with gusts as high as 24 mph.
Thursday Night
Mostly cloudy, with a low around 24. West wind 6 to 8 mph, with gusts as high as 20 mph.
Friday
Partly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 9.
Saturday
Partly sunny and cold, with a high near 18.
Saturday Night
A 40 percent chance of snow after 1am. Mostly cloudy, with a low around 10.
Sunday
A 50 percent chance of snow. Cloudy, with a high near 22.
Sunday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 13.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 25.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Mostly sunny, with a high near 26.
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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:
3:33 pm EST Jan 20, 2026
Forecast Valid:
4pm EST Jan 20, 2026-6pm EST Jan 27, 2026
 
Forecast Discussion
 
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Additional Resources

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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