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.

Overcast

48°F

9°C

Humidity 93%
Wind Speed Calm
Barometer 29.73 in (1006.7 mb)
Dewpoint 46°F (8°C)
Visibility 8.00 mi
Last update 22 Mar 6:56 pm EDT
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Rain, mainly after 8pm. Low around 38. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 38 °F

    Rain

  • Monday

    Monday: Rain, mainly before 11am. High near 46. North wind 8 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 46 °F

    Rain then
    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30. Northwest wind around 8 mph.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 45. Wind chill values between 25 and 35 early. North wind around 7 mph becoming southwest in the afternoon.

    High: 45 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 34. Southwest wind around 6 mph.

    Low: 34 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 52.

    High: 52 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain likely, mainly after 2am. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.

    Low: 42 °F

    Chance Rain
    then Rain
    Likely

Detailed Forecast

Tonight
Rain, mainly after 8pm. Low around 38. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Rain, mainly before 11am. High near 46. North wind 8 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Partly cloudy, with a low around 30. Northwest wind around 8 mph.
Tuesday
Sunny, with a high near 45. Wind chill values between 25 and 35 early. North wind around 7 mph becoming southwest in the afternoon.
Tuesday Night
Increasing clouds, with a low around 34. Southwest wind around 6 mph.
Wednesday
Partly sunny, with a high near 50.
Wednesday Night
Mostly cloudy, with a low around 37.
Thursday
Mostly cloudy, with a high near 52.
Thursday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Friday
Rain likely before 8am. Partly sunny, with a high near 53. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 26.
Saturday
Sunny, with a high near 41.
Saturday Night
Mostly clear, with a low around 30.
Sunday
Mostly sunny, with a high near 47.
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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:
3:49 pm EDT Mar 22, 2026
Forecast Valid:
7pm EDT Mar 22, 2026-6pm EDT Mar 29, 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