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

33°F

1°C

Humidity 52%
Wind Speed N 12 mph
Barometer 30.32 in (1026.9 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 28 Mar 7:56 am EDT
Extended Forecast for

Lake Grove NY

  • Today

    Today: Mostly sunny, with a high near 42. Wind chill values between 25 and 35. Northwest wind 8 to 13 mph, with gusts as high as 26 mph.

    High: 42 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 27. Northwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 24 mph.

    Low: 27 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 47. Light south wind increasing to 10 to 15 mph in the morning.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 40. Southwest wind 9 to 13 mph, with gusts as high as 25 mph.

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 58. Southwest wind 8 to 13 mph.

    High: 58 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 62.

    High: 62 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Rain likely after 2pm. Partly sunny, with a high near 64. Chance of precipitation is 60%.

    High: 64 °F

    Mostly Sunny
    then Rain
    Likely

Detailed Forecast

Today
Mostly sunny, with a high near 42. Wind chill values between 25 and 35. Northwest wind 8 to 13 mph, with gusts as high as 26 mph.
Tonight
Mostly clear, with a low around 27. Northwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 24 mph.
Sunday
Mostly sunny, with a high near 47. Light south wind increasing to 10 to 15 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 40. Southwest wind 9 to 13 mph, with gusts as high as 25 mph.
Monday
Mostly cloudy, with a high near 58. Southwest wind 8 to 13 mph.
Monday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 44.
Tuesday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Rain likely after 2pm. Partly sunny, with a high near 64. Chance of precipitation is 60%.
Wednesday Night
Rain likely, mainly before 2am. Cloudy, with a low around 40. Chance of precipitation is 70%.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 49.
Thursday Night
A chance of rain and snow. Cloudy, with a low around 35. Chance of precipitation is 50%.
Friday
Rain and snow likely. Cloudy, with a high near 44. Chance of precipitation is 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:
4:58 am EDT Mar 28, 2026
Forecast Valid:
8am EDT Mar 28, 2026-6pm EDT Apr 3, 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