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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ABOUT THIS FORECAST

 
Point Forecast:
Lake Grove NY
 40.85°N 73.1°W (Elev. 144 ft)
1:35 am EST Jan 14, 2026
5am EST Jan 14, 2026-6pm EST Jan 20, 2026
 
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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