National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

38°F

3°C

Humidity 52%
Wind Speed N 8 mph
Barometer 30.26 in (1024.7 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 24 Dec 5:56 pm EST
Extended Forecast for

Lake Grove NY

Winter Storm Watch December 26, 04:00pm until December 27, 01:00pm
Click here for hazard details and duration
Winter Storm Watch

  • Tonight

    Tonight: Increasing clouds, with a low around 27. North wind 5 to 9 mph becoming calm in the evening.

    Low: 27 °F

    Increasing
    Clouds

  • Christmas Day

    Christmas Day: Partly sunny, with a high near 44. Wind chill values between 25 and 35. Southwest wind 6 to 13 mph becoming northwest in the afternoon.

    High: 44 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. North wind 10 to 14 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of snow after 1pm. Increasing clouds, with a high near 29. Wind chill values between 10 and 20. North wind 5 to 9 mph.

    High: 29 °F

    Partly Sunny
    then Chance
    Snow

  • Friday Night

    Friday Night: Snow. Steady temperature around 25. Calm wind becoming east 5 to 8 mph in the evening. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.

    Low: 25 °F

    Snow

  • Saturday

    Saturday: A 50 percent chance of snow before 1pm. Cloudy, with a high near 33.

    High: 33 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 39.

    High: 39 °F

    Mostly Cloudy
    then Chance
    Rain

  • Sunday Night

    Sunday Night: Rain. Low around 29. Chance of precipitation is 90%.

    Low: 29 °F

    Rain

Detailed Forecast

Tonight
Increasing clouds, with a low around 27. North wind 5 to 9 mph becoming calm in the evening.
Christmas Day
Partly sunny, with a high near 44. Wind chill values between 25 and 35. Southwest wind 6 to 13 mph becoming northwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. North wind 10 to 14 mph.
Friday
A 30 percent chance of snow after 1pm. Increasing clouds, with a high near 29. Wind chill values between 10 and 20. North wind 5 to 9 mph.
Friday Night
Snow. Steady temperature around 25. Calm wind becoming east 5 to 8 mph in the evening. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.
Saturday
A 50 percent chance of snow before 1pm. Cloudy, with a high near 33.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 39.
Sunday Night
Rain. Low around 29. Chance of precipitation is 90%.
Monday
Rain likely, mainly before 1pm. Mostly cloudy, with a high near 43. Chance of precipitation is 60%.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Partly sunny, with a high near 31.
Tuesday Night
Partly cloudy, with a low around 22.
Wednesday
Partly sunny, with a high near 35.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Grove NY
 40.85°N 73.1°W (Elev. 144 ft)
Last Update:
1:05 pm EST Dec 24, 2025
Forecast Valid:
6pm EST Dec 24, 2025-6pm EST Dec 31, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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