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

30°F

-1°C

Humidity 36%
Wind Speed N 8 mph
Barometer 30.43 in (1030.5 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 1 Mar 9:56 pm EST
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Mostly clear, with a low around 17. Wind chill values between 10 and 15. North wind around 8 mph.

    Low: 17 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 29. Wind chill values between 10 and 20. North wind around 5 mph becoming calm in the afternoon.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 21. Calm wind.

    Low: 21 °F

    Mostly Clear

  • Tuesday

    Tuesday: Rain likely, possibly mixed with snow before 1pm, then rain. High near 40. Southeast wind 3 to 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 40 °F

    Rain/Snow
    Likely then
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain. Low around 35. South wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Cloudy, with a high near 52.

    High: 52 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain. Cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 17. Wind chill values between 10 and 15. North wind around 8 mph.
Monday
Mostly sunny, with a high near 29. Wind chill values between 10 and 20. North wind around 5 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 21. Calm wind.
Tuesday
Rain likely, possibly mixed with snow before 1pm, then rain. High near 40. Southeast wind 3 to 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Tuesday Night
Rain. Low around 35. South wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
A 50 percent chance of rain. Cloudy, with a low around 36.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 52.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 37.
Friday
A 40 percent chance of rain before 1pm. Cloudy, with a high near 43.
Friday Night
Cloudy, with a low around 35.
Saturday
Cloudy, with a high near 51.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 40.
Sunday
Mostly cloudy, with a high near 52.
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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:
6:17 pm EST Mar 1, 2026
Forecast Valid:
10pm EST Mar 1, 2026-6pm EDT Mar 8, 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