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

65°F

18°C

Humidity 66%
Wind Speed SW 12 mph
Barometer 29.86 in (1011.2 mb)
Dewpoint 53°F (12°C)
Visibility 9.00 mi
Last update 15 Apr 6:56 pm EDT
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 56. Southwest wind 3 to 7 mph. Chance of precipitation is 40%.

    Low: 56 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 79. Light southwest wind becoming south 5 to 10 mph in the morning.

    High: 79 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 57. Southwest wind 5 to 8 mph.

    Low: 57 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 73. West wind 3 to 7 mph.

    High: 73 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 50. Light northeast wind.

    Low: 50 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers likely, mainly after 8am. Cloudy, with a high near 58. Chance of precipitation is 60%.

    High: 58 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 56. Southwest wind 3 to 7 mph. Chance of precipitation is 40%.
Thursday
Mostly sunny, with a high near 79. Light southwest wind becoming south 5 to 10 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 57. Southwest wind 5 to 8 mph.
Friday
A 40 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 73. West wind 3 to 7 mph.
Friday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 50. Light northeast wind.
Saturday
Partly sunny, with a high near 61.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 46.
Sunday
Showers likely, mainly after 8am. Cloudy, with a high near 58. Chance of precipitation is 60%.
Sunday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 37.
Monday
Mostly sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Sunny, with a high near 54.
Tuesday Night
Partly cloudy, with a low around 43.
Wednesday
Partly sunny, with a high near 63.
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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:
7:26 pm EDT Apr 15, 2026
Forecast Valid:
7pm EDT Apr 15, 2026-6pm EDT Apr 22, 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