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

51°F

11°C

Humidity 48%
Wind Speed N 14 G 24 mph
Barometer 30.17 in (1021.7 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 17 Oct 2:56 pm EDT
Extended Forecast for

Lake Ronkonkoma NY

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 37. North wind 8 to 14 mph, with gusts as high as 24 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 56. Northeast wind 6 to 8 mph.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 41. Light northeast wind.

    Low: 41 °F

    Clear

  • Monday

    Monday: Increasing clouds, with a high near 62. Northeast wind 8 to 10 mph.

    High: 62 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 45. North wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 45 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 37. North wind 8 to 14 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 56. Northeast wind 6 to 8 mph.
Sunday Night
Clear, with a low around 41. Light northeast wind.
Monday
Increasing clouds, with a high near 62. Northeast wind 8 to 10 mph.
Monday Night
Mostly cloudy, with a low around 45. North wind 8 to 13 mph, with gusts as high as 23 mph.
Tuesday
Partly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 59.
Wednesday Night
Mostly cloudy, with a low around 43.
Thursday
Partly sunny, with a high near 61.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Ronkonkoma NY
 40.83°N 73.14°W (Elev. 98 ft)
Last Update:
2:23 pm EDT Oct 17, 2026
Forecast Valid:
3pm EDT Oct 17, 2026-6pm EDT Oct 24, 2026
 
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Additional Resources

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