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

60°F

16°C

Humidity 80%
Wind Speed SW 10 mph
Barometer 29.75 in (1007.2 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 16 Apr 10:56 pm EDT
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 56. West wind 3 to 6 mph.

    Low: 56 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 11am, then a chance of showers after 2pm. Partly sunny, with a high near 75. Northwest wind 3 to 7 mph. Chance of precipitation is 40%.

    High: 75 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 51. Light northeast wind.

    Low: 51 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 62. East wind 5 to 8 mph.

    High: 62 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 47. Southeast wind around 5 mph becoming calm in the evening.

    Low: 47 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 58. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 58 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 8pm. Low around 38. Chance of precipitation is 80%.

    Low: 38 °F

    Showers then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 56. West wind 3 to 6 mph.
Friday
A slight chance of showers before 11am, then a chance of showers after 2pm. Partly sunny, with a high near 75. Northwest wind 3 to 7 mph. Chance of precipitation is 40%.
Friday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 51. Light northeast wind.
Saturday
Partly sunny, with a high near 62. East wind 5 to 8 mph.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 47. Southeast wind around 5 mph becoming calm in the evening.
Sunday
Showers, mainly after 8am. High near 58. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Showers, mainly before 8pm. Low around 38. Chance of precipitation is 80%.
Monday
Mostly sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 33.
Tuesday
Sunny, with a high near 52.
Tuesday Night
Partly cloudy, with a low around 42.
Wednesday
Partly sunny, with a high near 62.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Mostly sunny, with a high near 61.
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:
7:20 pm EDT Apr 16, 2026
Forecast Valid:
11pm EDT Apr 16, 2026-6pm EDT Apr 23, 2026
 
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