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.

Overcast

32°F

0°C

Humidity 69%
Wind Speed N 10 mph
Barometer 29.83 in (1010.1 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 12 Feb 1:56 am EST
Extended Forecast for

Lake Grove NY

  • Overnight

    Overnight: A 20 percent chance of snow showers before 4am. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. Northwest wind around 13 mph, with gusts as high as 24 mph.

    Low: 24 °F

    Slight Chance
    Snow Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 35. Wind chill values between 15 and 25. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.

    High: 35 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 7 to 11 mph, with gusts as high as 23 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 34. Wind chill values between 10 and 20. Northwest wind 7 to 11 mph.

    High: 34 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow showers, mainly after 10pm. Increasing clouds, with a low around 24. West wind around 6 mph.

    Low: 24 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.

    Low: 28 °F

    Chance
    Rain/Snow

Detailed Forecast

Overnight
A 20 percent chance of snow showers before 4am. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. Northwest wind around 13 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 35. Wind chill values between 15 and 25. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.
Thursday Night
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 7 to 11 mph, with gusts as high as 23 mph.
Friday
Sunny, with a high near 34. Wind chill values between 10 and 20. Northwest wind 7 to 11 mph.
Friday Night
A 30 percent chance of snow showers, mainly after 10pm. Increasing clouds, with a low around 24. West wind around 6 mph.
Saturday
Mostly sunny, with a high near 39.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly cloudy, with a high near 37.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
Washington's Birthday
Mostly sunny, with a high near 41.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 43.
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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:
2:21 am EST Feb 12, 2026
Forecast Valid:
2am EST Feb 12, 2026-6pm EST Feb 18, 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