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.

Mostly Cloudy

82°F

28°C

Humidity 53%
Wind Speed S 8 mph
Barometer 29.96 in (1014.3 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 10 Aug 1:56 pm EDT
Extended Forecast for

Lake Grove NY

Heat Advisory August 10, 02:21pm until August 10, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 10, 02:21pm until August 10, 07:00pm

    NOW until 7:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 88 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 8pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 74. Southwest wind 5 to 7 mph.

    Low: 74 °F

    Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. West wind 7 to 9 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70. North wind 3 to 6 mph.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. Light and variable wind becoming north around 5 mph in the morning.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers after 2am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 87.

    High: 87 °F

    Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 88. South wind around 8 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 8pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 74. Southwest wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 89. West wind 7 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 70. North wind 3 to 6 mph.
Wednesday
Mostly sunny, with a high near 86. Light and variable wind becoming north around 5 mph in the morning.
Wednesday Night
A 40 percent chance of showers after 2am. Partly cloudy, with a low around 71.
Thursday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 87.
Thursday Night
Partly cloudy, with a low around 69.
Friday
Mostly sunny, with a high near 83.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 81.
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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:
3:02 am EDT Aug 10, 2026
Forecast Valid:
2pm EDT Aug 10, 2026-6pm EDT Aug 16, 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