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

38°F

3°C

Humidity 39%
Wind Speed S 8 mph
Barometer 30.13 in (1020.2 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 27 Feb 11:56 am EST
Extended Forecast for

Lake Grove NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 41. South wind 3 to 5 mph.

    High: 41 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 28. Light south wind.

    Low: 28 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 47. South wind 3 to 7 mph.

    High: 47 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Light and variable wind.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Scattered snow showers before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 37. Northwest wind 5 to 11 mph. Chance of precipitation is 40%.

    High: 37 °F

    Scattered
    Snow Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 28.

    High: 28 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow after 1pm. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.

    High: 37 °F

    Partly Sunny
    then Chance
    Rain/Snow

Detailed Forecast

This Afternoon
Sunny, with a high near 41. South wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 28. Light south wind.
Saturday
Mostly sunny, with a high near 47. South wind 3 to 7 mph.
Saturday Night
Partly cloudy, with a low around 29. Light and variable wind.
Sunday
Scattered snow showers before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 37. Northwest wind 5 to 11 mph. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 16.
Monday
Mostly cloudy, with a high near 28.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
A chance of rain and snow after 1pm. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Tuesday Night
Rain likely. Cloudy, with a low around 30. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
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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:
12:50 am EST Feb 27, 2026
Forecast Valid:
12pm EST Feb 27, 2026-6pm EST Mar 5, 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