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.

Overcast

44°F

7°C

Humidity 76%
Wind Speed SE 8 mph
Barometer 29.57 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 14 Jan 4:56 pm EST
Extended Forecast for

Lake Grove NY

  • This Afternoon

    This Afternoon: A 20 percent chance of rain. Cloudy, with a steady temperature around 45. South wind around 6 mph.

    High: 45 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: A 50 percent chance of rain, mainly after 4am. Cloudy, with a low around 39. South wind around 6 mph.

    Low: 39 °F

    Chance Rain

  • Thursday

    Thursday: A 30 percent chance of rain before 7am. Mostly cloudy, then gradually becoming sunny, with a temperature rising to near 42 by 11am, then falling to around 33 during the remainder of the day. Wind chill values between 20 and 30. West wind 7 to 17 mph.

    High: 42 °F⇓

    Chance Rain
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 20. Wind chill values between 5 and 15. West wind 15 to 17 mph.

    Low: 20 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 36. West wind 11 to 18 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a steady temperature around 32.

    Low: 32 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 40 percent chance of rain. Mostly cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 34.

    High: 34 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

This Afternoon
A 20 percent chance of rain. Cloudy, with a steady temperature around 45. South wind around 6 mph.
Tonight
A 50 percent chance of rain, mainly after 4am. Cloudy, with a low around 39. South wind around 6 mph.
Thursday
A 30 percent chance of rain before 7am. Mostly cloudy, then gradually becoming sunny, with a temperature rising to near 42 by 11am, then falling to around 33 during the remainder of the day. Wind chill values between 20 and 30. West wind 7 to 17 mph.
Thursday Night
Partly cloudy, with a low around 20. Wind chill values between 5 and 15. West wind 15 to 17 mph.
Friday
Sunny, with a high near 36. West wind 11 to 18 mph.
Friday Night
Mostly cloudy, with a steady temperature around 32.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 34.
Sunday Night
A 30 percent chance of snow before 1am. Partly cloudy, with a low around 20.
M.L.King Day
Sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 16.
Tuesday
Mostly sunny, with a high near 26.
Tuesday Night
Partly cloudy, with a low around 14.
Wednesday
Mostly sunny, with a high near 30.
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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:
2:31 pm EST Jan 14, 2026
Forecast Valid:
5pm EST Jan 14, 2026-6pm EST Jan 21, 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