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

61°F

16°C

Humidity 56%
Wind Speed N 9 mph
Barometer 30.15 in (1020.7 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 21 May 7:56 am EDT
Extended Forecast for

Lake Grove NY

  • Today

    Today: Showers likely, mainly before 2pm. Cloudy, with a high near 66. Northeast wind 7 to 9 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 66 °F

    Showers
    Likely

  • Tonight

    Tonight: Mostly cloudy, with a low around 52. Calm wind.

    Low: 52 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 67. East wind around 11 mph.

    High: 67 °F

    Partly Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 50. East wind 3 to 6 mph.

    Low: 50 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Showers likely, mainly after 2pm. Cloudy, with a high near 63. East wind 9 to 14 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers. Low around 51. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 51 °F

    Showers

  • Sunday

    Sunday: Showers, mainly before 2pm. High near 67. Breezy. Chance of precipitation is 80%.

    High: 67 °F

    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 2am. Cloudy, with a low around 56.

    Low: 56 °F

    Chance
    Showers

  • Memorial Day

    Memorial Day: A 50 percent chance of showers after 8am. Mostly cloudy, with a high near 74.

    High: 74 °F

    Chance
    Showers

Detailed Forecast

Today
Showers likely, mainly before 2pm. Cloudy, with a high near 66. Northeast wind 7 to 9 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Mostly cloudy, with a low around 52. Calm wind.
Friday
Partly sunny, with a high near 67. East wind around 11 mph.
Friday Night
Increasing clouds, with a low around 50. East wind 3 to 6 mph.
Saturday
Showers likely, mainly after 2pm. Cloudy, with a high near 63. East wind 9 to 14 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Showers. Low around 51. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
Showers, mainly before 2pm. High near 67. Breezy. Chance of precipitation is 80%.
Sunday Night
A 30 percent chance of showers before 2am. Cloudy, with a low around 56.
Memorial Day
A 50 percent chance of showers after 8am. Mostly cloudy, with a high near 74.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 58.
Tuesday
Partly sunny, with a high near 78.
Tuesday Night
Mostly cloudy, with a low around 61.
Wednesday
Mostly sunny, with a high near 82.
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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:
2:19 am EDT May 21, 2026
Forecast Valid:
8am EDT May 21, 2026-6pm EDT May 27, 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