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

55°F

13°C

Humidity 77%
Wind Speed SE 15 mph
Barometer 30.00 in (1015.8 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 18 Apr 5:56 pm EDT
Extended Forecast for

Lake Grove NY

Coastal Flood Advisory April 18, 11:00pm until April 19, 02:00am
Click here for hazard details and duration
...

  • Tonight

    Tonight: A 30 percent chance of showers after 5am. Patchy fog after 8pm. Otherwise, cloudy, with a low around 47. South wind 3 to 8 mph.

    Low: 47 °F

    Patchy Fog
    then Chance
    Showers and
    Areas Fog

  • Sunday

    Sunday: Showers, mainly before 5pm. Patchy fog before 8am. High near 57. South wind 6 to 15 mph becoming northwest in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 57 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. West wind 3 to 6 mph.

    Low: 38 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers. Mostly sunny, with a high near 52. Northwest wind 7 to 10 mph.

    High: 52 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 33. North wind around 8 mph.

    Low: 33 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of showers after 5am. Patchy fog after 8pm. Otherwise, cloudy, with a low around 47. South wind 3 to 8 mph.
Sunday
Showers, mainly before 5pm. Patchy fog before 8am. High near 57. South wind 6 to 15 mph becoming northwest in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. West wind 3 to 6 mph.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 52. Northwest wind 7 to 10 mph.
Monday Night
Partly cloudy, with a low around 33. North wind around 8 mph.
Tuesday
Sunny, with a high near 52.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Mostly cloudy, with a high near 59.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Sunny, with a high near 64.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 63.
Friday Night
Partly cloudy, with a low around 46.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 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:
6:34 pm EDT Apr 18, 2026
Forecast Valid:
6pm EDT Apr 18, 2026-6pm EDT Apr 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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