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.

Partly Cloudy

57°F

14°C

Humidity 49%
Wind Speed NW 7 mph
Barometer 29.96 in (1014.4 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 11 Nov 9:56 am EST
Extended Forecast for

Lake Grove NY

  • Veterans Day

    Veterans Day: Mostly sunny, with a temperature rising to near 61 by noon, then falling to around 56 during the remainder of the day. West wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 61 °F⇓

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. Calm wind becoming east around 6 mph after midnight.

    Low: 46 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of rain and thunderstorms before 1pm, then rain likely and possibly a thunderstorm between 1pm and 4pm, then rain likely after 4pm. Mostly cloudy, with a high near 60. East wind 8 to 13 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 60 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain. Low around 42. North wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 42 °F

    Rain

  • Friday

    Friday: Rain. High near 50. North wind around 15 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 50 °F

    Rain

  • Friday Night

    Friday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

Detailed Forecast

Veterans Day
Mostly sunny, with a temperature rising to near 61 by noon, then falling to around 56 during the remainder of the day. West wind 5 to 7 mph becoming light and variable in the afternoon.
Tonight
Mostly cloudy, with a low around 46. Calm wind becoming east around 6 mph after midnight.
Thursday
A chance of rain and thunderstorms before 1pm, then rain likely and possibly a thunderstorm between 1pm and 4pm, then rain likely after 4pm. Mostly cloudy, with a high near 60. East wind 8 to 13 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Rain. Low around 42. North wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain. High near 50. North wind around 15 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 35.
Saturday
Partly sunny, with a high near 49.
Saturday Night
Mostly cloudy, with a low around 35.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Partly cloudy, with a low around 35.
Monday
Sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Sunny, with a high near 52.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lake Grove NY
 40.85°N 73.13°W (Elev. 98 ft)
Last Update:
8:57 am EST Nov 11, 2026
Forecast Valid:
10am EST Nov 11, 2026-6pm EST Nov 17, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation