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

N/A

Humidity NA
Wind Speed SW 8 mph
Barometer 29.67 in
Dewpoint N/A
Visibility 10.00 mi
Last update 14 Jan 4:56 am EST
Extended Forecast for

Lake Grove NY

  • Overnight

    Overnight: Isolated showers. Cloudy, with a low around 40. South wind around 9 mph. Chance of precipitation is 20%.

    Low: 40 °F

    Isolated
    Showers

  • Wednesday

    Wednesday: Cloudy, with a high near 47. Southwest wind 6 to 9 mph.

    High: 47 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers, mainly after 10pm. Cloudy, with a steady temperature around 41. Calm wind becoming west around 5 mph after midnight.

    Low: 41 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of rain and snow showers before 10am, then a slight chance of snow showers between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 31 by 5pm. Wind chill values between 20 and 30. West wind 6 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

    High: 42 °F⇓

    Slight Chance
    Rain/Snow
    then Slight
    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19. West wind 11 to 13 mph, with gusts as high as 30 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Isolated showers. Cloudy, with a low around 40. South wind around 9 mph. Chance of precipitation is 20%.
Wednesday
Cloudy, with a high near 47. Southwest wind 6 to 9 mph.
Wednesday Night
A 50 percent chance of showers, mainly after 10pm. Cloudy, with a steady temperature around 41. Calm wind becoming west around 5 mph after midnight.
Thursday
A slight chance of rain and snow showers before 10am, then a slight chance of snow showers between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 31 by 5pm. Wind chill values between 20 and 30. West wind 6 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 19. West wind 11 to 13 mph, with gusts as high as 30 mph.
Friday
Mostly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 28.
Saturday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 41.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
Partly sunny, with a high near 33.
Sunday Night
Partly cloudy, with a low around 20.
M.L.King Day
Mostly sunny, with a high near 32.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 29.
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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:
1:35 am EST Jan 14, 2026
Forecast Valid:
5am EST Jan 14, 2026-6pm EST Jan 20, 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