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.

Fair

49°F

9°C

Humidity 64%
Wind Speed S 10 mph
Barometer 30.28 in (1025.5 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 13 Apr 1:56 am EDT
Extended Forecast for

Lake Grove NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 46. South wind around 7 mph.

    Low: 46 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 74. Southwest wind 10 to 16 mph, with gusts as high as 30 mph.

    High: 74 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. West wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 74. Calm wind becoming south 5 to 9 mph in the morning.

    High: 74 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 5 to 8 mph.

    Low: 55 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.

    Low: 56 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 46. South wind around 7 mph.
Monday
Mostly cloudy, with a high near 74. Southwest wind 10 to 16 mph, with gusts as high as 30 mph.
Monday Night
Mostly clear, with a low around 54. West wind 6 to 10 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 74. Calm wind becoming south 5 to 9 mph in the morning.
Tuesday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 5 to 8 mph.
Wednesday
Mostly sunny, with a high near 77.
Wednesday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.
Thursday
Partly sunny, with a high near 73.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Partly sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 50.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 65.
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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:
1:48 am EDT Apr 13, 2026
Forecast Valid:
2am EDT Apr 13, 2026-6pm EDT Apr 19, 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