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.

Fog/Mist

40°F

4°C

Humidity 93%
Wind Speed E 10 mph
Barometer 30.43 in (1030.4 mb)
Dewpoint 38°F (3°C)
Visibility 3.00 mi
Wind Chill34°F (1°C)
Last update 3 Apr 1:56 am EDT
Extended Forecast for

Lake Grove NY

  • Overnight

    Overnight: A 20 percent chance of showers before 5am. Patchy fog. Otherwise, cloudy, with a low around 39. East wind around 5 mph.

    Low: 39 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Friday

    Friday: Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 60. Calm wind becoming southwest 5 to 9 mph in the afternoon.

    High: 60 °F

    Areas Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 50 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 65. Calm wind becoming east 5 to 9 mph in the morning.

    High: 65 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers, mainly after 8pm. Cloudy, with a low around 42. East wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 60. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 39.

    Low: 39 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers before 5am. Patchy fog. Otherwise, cloudy, with a low around 39. East wind around 5 mph.
Friday
Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 60. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Friday Night
Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.
Saturday
A 20 percent chance of showers after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 65. Calm wind becoming east 5 to 9 mph in the morning.
Saturday Night
A 50 percent chance of showers, mainly after 8pm. Cloudy, with a low around 42. East wind 6 to 10 mph, with gusts as high as 20 mph.
Sunday
Showers. High near 60. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 39.
Monday
Mostly sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 31.
Wednesday
Sunny, with a high near 48.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Sunny, with a high near 54.
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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:
2:20 am EDT Apr 3, 2026
Forecast Valid:
4am EDT Apr 3, 2026-6pm EDT Apr 9, 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