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.

Light Rain Fog/Mist and Breezy

57°F

14°C

Humidity 90%
Wind Speed NE 25 G 38 mph
Barometer 29.75 in (1007.3 mb)
Dewpoint 54°F (12°C)
Visibility 2.50 mi
Last update 26 Sep 9:56 am EDT
Extended Forecast for

Lake Grove NY

Wind Advisory September 26, 10:04am until September 27, 06:00am
Coastal Flood Warning September 26, 10:04am until September 27, 06:00pm
Click here for hazard details and duration
Wind Advisory
Coastal Flood Warning
  •  
    Wind Advisory September 26, 10:04am until September 27, 06:00am
    Coastal Flood Warning September 26, 10:04am until September 27, 06:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Today

    High: 63 °F

    Rain and
    Windy

  • Tonight

    Tonight: Rain, with thunderstorms also possible after 11pm. Low around 56. Windy, with a north wind 26 to 29 mph, with gusts as high as 46 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    Low: 56 °F

    Rain and
    Windy

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 5pm. High near 68. Breezy, with an east wind 18 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 68 °F

    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 59. East wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    Low: 59 °F

    Showers

  • Monday

    Monday: Showers, mainly before 2pm. High near 66. Northeast wind 11 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 66 °F

    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    Showers then
    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Today
Rain and possibly a thunderstorm. High near 63. Windy, with a north wind 28 to 33 mph, with gusts as high as 46 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Rain, with thunderstorms also possible after 11pm. Low around 56. Windy, with a north wind 26 to 29 mph, with gusts as high as 46 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers, with thunderstorms also possible after 5pm. High near 68. Breezy, with an east wind 18 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Showers and possibly a thunderstorm. Low around 59. East wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Monday
Showers, mainly before 2pm. High near 66. Northeast wind 11 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 57.
Tuesday
Partly sunny, with a high near 70.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 59.
Thursday
Mostly sunny, with a high near 72.
Thursday Night
Partly cloudy, with a low around 61.
Friday
Partly sunny, with a high near 73.
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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:
6:02 am EDT Sep 26, 2026
Forecast Valid:
10am EDT Sep 26, 2026-6pm EDT Oct 2, 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