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

48°F

9°C

Humidity 48%
Wind Speed N 20 G 25 mph
Barometer 30.03 in (1017.0 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 27 Mar 1:56 pm EDT
Extended Forecast for

Lake Grove NY

  • This Afternoon

    This Afternoon: Mostly cloudy, with a steady temperature around 48. North wind 11 to 13 mph.

    High: 48 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. North wind 5 to 7 mph.

    Low: 30 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 9 to 13 mph.

    High: 41 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. Northwest wind around 6 mph becoming calm after midnight.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 46. South wind 5 to 14 mph, with gusts as high as 26 mph.

    High: 46 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 55.

    High: 55 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain. Partly sunny, with a high near 56.

    High: 56 °F

    Chance Rain

Detailed Forecast

This Afternoon
Mostly cloudy, with a steady temperature around 48. North wind 11 to 13 mph.
Tonight
Mostly cloudy, with a low around 30. North wind 5 to 7 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 9 to 13 mph.
Saturday Night
Partly cloudy, with a low around 28. Northwest wind around 6 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 46. South wind 5 to 14 mph, with gusts as high as 26 mph.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Partly sunny, with a high near 55.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
A 30 percent chance of rain. Partly sunny, with a high near 56.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 44.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 60.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 60.
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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:
7:52 am EDT Mar 27, 2026
Forecast Valid:
2pm EDT Mar 27, 2026-6pm EDT Apr 2, 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