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

27°F

-3°C

Humidity 89%
Wind Speed Calm
Barometer 30.15 in (1021.0 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 27 Feb 10:56 pm EST
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Patchy fog before 1am, then patchy fog after 2am. Otherwise, partly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 45. Calm wind becoming southwest around 6 mph.

    High: 45 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog between 9pm and 3am. Otherwise, partly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Patchy Fog

  • Sunday

    Sunday: Snow showers likely, mainly between 10am and 4pm. Patchy fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 38. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 38 °F

    Snow Showers
    Likely and
    Patchy Fog

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers before 7pm. Mostly clear, with a low around 16. North wind around 7 mph.

    Low: 16 °F

    Chance Snow
    Showers then
    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny

  • Monday Night

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

    Low: 19 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.

    High: 41 °F

    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Rain Likely

Detailed Forecast

Tonight
Patchy fog before 1am, then patchy fog after 2am. Otherwise, partly cloudy, with a low around 28. Calm wind.
Saturday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 45. Calm wind becoming southwest around 6 mph.
Saturday Night
Patchy fog between 9pm and 3am. Otherwise, partly cloudy, with a low around 28. Calm wind.
Sunday
Snow showers likely, mainly between 10am and 4pm. Patchy fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 38. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
A 30 percent chance of snow showers before 7pm. Mostly clear, with a low around 16. North wind around 7 mph.
Monday
Partly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.
Tuesday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 45.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 33.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 45.
Thursday Night
Rain likely. Cloudy, with a low around 34. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Cloudy, with a high near 42.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Grove NY
 40.85°N 73.1°W (Elev. 144 ft)
Last Update:
8:51 pm EST Feb 27, 2026
Forecast Valid:
11pm EST Feb 27, 2026-6pm EST Mar 6, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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