National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

81°F

27°C

Humidity 69%
Wind Speed S 15 G 24 mph
Barometer 29.74 in (1007.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 19 Jun 3:56 pm EDT
Extended Forecast for

Lake Ronkonkoma NY

  • Juneteenth

    Juneteenth: A 40 percent chance of showers and thunderstorms after 5pm. Some of the storms could be severe. Mostly sunny, with a steady temperature around 84. South wind around 13 mph, with gusts as high as 28 mph.

    High: 84 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms before 2am. Some of the storms could be severe. Mostly cloudy, with a low around 66. Southwest wind around 10 mph, with gusts as high as 22 mph.

    Low: 66 °F

    Severe
    Thunderstorms

  • Friday

    Friday: Sunny, with a high near 84. West wind around 16 mph.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 67. West wind 5 to 8 mph.

    Low: 67 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 85. Southwest wind 6 to 9 mph.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 69.

    Low: 69 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 88.

    High: 88 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

Detailed Forecast

Juneteenth
A 40 percent chance of showers and thunderstorms after 5pm. Some of the storms could be severe. Mostly sunny, with a steady temperature around 84. South wind around 13 mph, with gusts as high as 28 mph.
Tonight
A 40 percent chance of showers and thunderstorms before 2am. Some of the storms could be severe. Mostly cloudy, with a low around 66. Southwest wind around 10 mph, with gusts as high as 22 mph.
Friday
Sunny, with a high near 84. West wind around 16 mph.
Friday Night
Partly cloudy, with a low around 67. West wind 5 to 8 mph.
Saturday
Mostly sunny, with a high near 85. Southwest wind 6 to 9 mph.
Saturday Night
Mostly cloudy, with a low around 69.
Sunday
Partly sunny, with a high near 88.
Sunday Night
Mostly clear, with a low around 71.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 72.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
Mostly sunny, with a high near 89.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Partly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Ronkonkoma NY
 40.83°N 73.11°W (Elev. 98 ft)
Last Update:
2:38 pm EDT Jun 19, 2025
Forecast Valid:
4pm EDT Jun 19, 2025-6pm EDT Jun 26, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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