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

56°F

13°C

Humidity 81%
Wind Speed SW 13 mph
Barometer 29.91 in (1012.7 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 1 Apr 4:56 am EDT
Extended Forecast for

Lake Grove NY

  • Today

    Today: A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 73. Southwest wind 8 to 11 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 73 °F

    Chance
    Showers then
    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 11pm, then showers likely. Patchy fog after 2am. Low around 40. Northeast wind 5 to 11 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Showers and
    Patchy Fog

  • Thursday

    Thursday: A 40 percent chance of rain, mainly before 2pm. Patchy fog before 2pm. Otherwise, cloudy, with a high near 45. East wind around 14 mph.

    High: 45 °F

    Chance Rain
    and Patchy
    Fog

  • Thursday Night

    Thursday Night: A slight chance of rain or drizzle before 8pm, then a chance of drizzle or light rain, mainly after 2am. Areas of fog after 8pm. Otherwise, cloudy, with a low around 39. East wind 6 to 10 mph. Chance of precipitation is 30%.

    Low: 39 °F

    Chance Light
    Rain and
    Areas Fog

  • Friday

    Friday: A chance of drizzle or light rain, mainly before 8am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 59. Light and variable wind becoming southwest 5 to 9 mph in the afternoon. Chance of precipitation is 30%.

    High: 59 °F

    Chance Light
    Rain and
    Areas Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 8pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers likely. Mostly cloudy, with a high near 59. Chance of precipitation is 70%.

    High: 59 °F

    Showers
    Likely

Detailed Forecast

Today
A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 73. Southwest wind 8 to 11 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and possibly a thunderstorm before 11pm, then showers likely. Patchy fog after 2am. Low around 40. Northeast wind 5 to 11 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
A 40 percent chance of rain, mainly before 2pm. Patchy fog before 2pm. Otherwise, cloudy, with a high near 45. East wind around 14 mph.
Thursday Night
A slight chance of rain or drizzle before 8pm, then a chance of drizzle or light rain, mainly after 2am. Areas of fog after 8pm. Otherwise, cloudy, with a low around 39. East wind 6 to 10 mph. Chance of precipitation is 30%.
Friday
A chance of drizzle or light rain, mainly before 8am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 59. Light and variable wind becoming southwest 5 to 9 mph in the afternoon. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 50.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
A 30 percent chance of showers after 8pm. Mostly cloudy, with a low around 47.
Sunday
Showers likely. Mostly cloudy, with a high near 59. Chance of precipitation is 70%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Mostly sunny, with a high near 50.
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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:
5:58 am EDT Apr 1, 2026
Forecast Valid:
6am EDT Apr 1, 2026-6pm EDT Apr 7, 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