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

43°F

6°C

Humidity 45%
Wind Speed SE 10 G 17 mph
Barometer 30.59 in (1036.0 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 8 Apr 2:56 pm EDT
Extended Forecast for

Lake Grove NY

  • Tonight

    Tonight: Widespread frost, mainly after 1am. Otherwise, clear, with a low around 32. South wind around 5 mph becoming calm in the evening.

    Low: 32 °F

    Frost

  • Thursday

    Thursday: Areas of frost before 9am. Otherwise, sunny, with a high near 51. Calm wind becoming southeast 5 to 7 mph in the afternoon.

    High: 51 °F

    Areas Frost
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 36. Light south wind.

    Low: 36 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 57. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 57 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 45. South wind around 7 mph.

    Low: 45 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 59.

    High: 59 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Widespread frost, mainly after 1am. Otherwise, clear, with a low around 32. South wind around 5 mph becoming calm in the evening.
Thursday
Areas of frost before 9am. Otherwise, sunny, with a high near 51. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 36. Light south wind.
Friday
Sunny, with a high near 57. Calm wind becoming south 5 to 9 mph in the afternoon.
Friday Night
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 45. South wind around 7 mph.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 59.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Sunny, with a high near 54.
Sunday Night
Mostly cloudy, with a low around 44.
Monday
Mostly cloudy, with a high near 64.
Monday Night
Mostly cloudy, with a low around 53.
Tuesday
Partly sunny, with a high near 71.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 71.
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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:
2:30 pm EDT Apr 8, 2026
Forecast Valid:
3pm EDT Apr 8, 2026-6pm EDT Apr 15, 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