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.

Overcast

47°F

8°C

Humidity 97%
Wind Speed SE 8 mph
Barometer 29.90 in (1012.5 mb)
Dewpoint 46°F (8°C)
Visibility 7.00 mi
Wind Chill43°F (6°C)
Last update 19 Apr 1:56 am EDT
Extended Forecast for

Lake Grove NY

  • Overnight

    Overnight: A 30 percent chance of showers after 5am. Areas of fog. Otherwise, cloudy, with a low around 47. Light south wind.

    Low: 47 °F

    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

Overnight
A 30 percent chance of showers after 5am. Areas of fog. Otherwise, cloudy, with a low around 47. Light south wind.
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:
2am EDT Apr 19, 2026-6pm EDT Apr 25, 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