Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

68°F

20°C

Humidity 76%
Wind Speed E 9 mph
Barometer 30.09 in (1018.7 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 20 Aug 7:56 am EDT
Extended Forecast for

Lake Ronkonkoma NY

  • Today

    Today: Showers likely, with thunderstorms also possible after 5pm.  Mostly cloudy, with a high near 74. East wind 9 to 15 mph.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 74 °F

    Chance
    Showers then
    Showers
    Likely

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 11pm, then showers likely.  Low around 63. East wind 13 to 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 63 °F

    Showers

  • Thursday

    Thursday: A 30 percent chance of showers, mainly before 8am.  Mostly cloudy, with a high near 73. Breezy, with a northeast wind 17 to 21 mph, with gusts as high as 33 mph.

    High: 73 °F

    Chance
    Showers and
    Breezy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 60. Breezy, with a north wind 18 to 21 mph, with gusts as high as 32 mph.

    Low: 60 °F

    Mostly Cloudy
    and Breezy

  • Friday

    Friday: Sunny, with a high near 81. North wind 11 to 18 mph, with gusts as high as 29 mph.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: A 30 percent chance of showers after 2pm.  Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Showers likely, with thunderstorms also possible after 5pm. Mostly cloudy, with a high near 74. East wind 9 to 15 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 63. East wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
A 30 percent chance of showers, mainly before 8am. Mostly cloudy, with a high near 73. Breezy, with a northeast wind 17 to 21 mph, with gusts as high as 33 mph.
Thursday Night
Mostly cloudy, with a low around 60. Breezy, with a north wind 18 to 21 mph, with gusts as high as 32 mph.
Friday
Sunny, with a high near 81. North wind 11 to 18 mph, with gusts as high as 29 mph.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 66.
Sunday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 80.
Sunday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Monday
Showers likely. Partly sunny, with a high near 82. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Sunny, with a high near 80.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Lake Ronkonkoma NY
 40.83°N 73.14°W (Elev. 98 ft)
2:48 am EDT Aug 20, 2025
8am EDT Aug 20, 2025-6pm EDT Aug 26, 2025
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database