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.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Lake Grove NY
 40.85°N 73.1°W (Elev. 144 ft)
2:31 pm EST Jan 14, 2026
5pm EST Jan 14, 2026-6pm EST Jan 21, 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