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

70°F

21°C

Humidity 79%
Wind Speed NW 5 mph
Barometer 29.97 in (1014.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 14 Aug 3:56 am EDT
Extended Forecast for

Lake Grove NY

  • Today

    Today: Mostly sunny, with a high near 85. Northwest wind 5 to 8 mph becoming southwest in the afternoon.

    High: 85 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 65. Calm wind becoming northeast around 6 mph after midnight.

    Low: 65 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81. Northeast wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62. South wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. South wind 5 to 13 mph.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Showers, mainly after 8pm. Low around 70. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 70 °F

    Showers

  • Monday

    Monday: A 30 percent chance of showers before 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 85.

    High: 85 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 85. Northwest wind 5 to 8 mph becoming southwest in the afternoon.
Tonight
Partly cloudy, with a low around 65. Calm wind becoming northeast around 6 mph after midnight.
Saturday
Sunny, with a high near 81. Northeast wind 7 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 62. South wind around 5 mph becoming calm in the evening.
Sunday
A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. South wind 5 to 13 mph.
Sunday Night
Showers, mainly after 8pm. Low around 70. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
A 30 percent chance of showers before 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
A 40 percent chance of showers. Mostly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lake Grove NY
 40.85°N 73.1°W (Elev. 144 ft)
Last Update:
3:11 am EDT Aug 14, 2026
Forecast Valid:
4am EDT Aug 14, 2026-6pm EDT Aug 20, 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