National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

37°F

3°C

Humidity 59%
Wind Speed N 9 mph
Barometer 30.11 in (1019.8 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 16 Feb 2:56 pm EST
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: A slight chance of freezing rain after 4am. Increasing clouds, with a low around 26. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 26 °F

    Partly Cloudy
    then Slight
    Chance
    Freezing Rain

  • Tuesday

    Tuesday: A slight chance of freezing rain before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 40. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 20%.

    High: 40 °F

    Slight Chance
    Freezing Rain
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 31. Light west wind.

    Low: 31 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Rain likely. Cloudy, with a high near 40. Calm wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 40 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: Rain likely before 1am, then a slight chance of rain, snow, and sleet. Mostly cloudy, with a low around 32. North wind 6 to 8 mph. Chance of precipitation is 60%. Little or no snow and sleet accumulation expected.

    Low: 32 °F

    Rain Likely
    then Wintry
    Mix Likely

  • Thursday

    Thursday: Mostly cloudy, with a high near 40.

    High: 40 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of rain and snow after 1am. Mostly cloudy, with a low around 29. Chance of precipitation is 30%.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Friday

    Friday: Rain and snow likely, becoming all rain after 1pm. Cloudy, with a high near 39. Chance of precipitation is 70%.

    High: 39 °F

    Rain/Snow
    Likely

  • Friday Night

    Friday Night: A chance of rain and snow. Cloudy, with a low around 31. Chance of precipitation is 50%.

    Low: 31 °F

    Chance
    Rain/Snow

Detailed Forecast

Tonight
A slight chance of freezing rain after 4am. Increasing clouds, with a low around 26. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Tuesday
A slight chance of freezing rain before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 40. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 20%.
Tuesday Night
Increasing clouds, with a low around 31. Light west wind.
Wednesday
Rain likely. Cloudy, with a high near 40. Calm wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain likely before 1am, then a slight chance of rain, snow, and sleet. Mostly cloudy, with a low around 32. North wind 6 to 8 mph. Chance of precipitation is 60%. Little or no snow and sleet accumulation expected.
Thursday
Mostly cloudy, with a high near 40.
Thursday Night
A chance of rain and snow after 1am. Mostly cloudy, with a low around 29. Chance of precipitation is 30%.
Friday
Rain and snow likely, becoming all rain after 1pm. Cloudy, with a high near 39. Chance of precipitation is 70%.
Friday Night
A chance of rain and snow. Cloudy, with a low around 31. Chance of precipitation is 50%.
Saturday
A 30 percent chance of rain. Mostly cloudy, with a high near 40.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
A chance of rain and snow. Partly sunny, with a high near 37. Chance of precipitation is 30%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 25. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 36.
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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:
3:08 pm EST Feb 16, 2026
Forecast Valid:
3pm EST Feb 16, 2026-6pm EST Feb 23, 2026
 
Forecast Discussion
 
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Additional Resources

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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