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.

Fog

66°F

19°C

Humidity 93%
Wind Speed SE 6 mph
Barometer 30.02 in (1016.5 mb)
Dewpoint 64°F (18°C)
Visibility 0.25 mi
Last update 17 Jun 4:56 pm EDT
Extended Forecast for

Lake Ronkonkoma NY

  • Tonight

    Tonight: A slight chance of showers between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Patchy fog. Otherwise, cloudy, with a low around 66. Southeast wind 5 to 7 mph. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Cloudy, with a high near 77. South wind 6 to 8 mph.

    High: 77 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 68. South wind around 6 mph.

    Low: 68 °F

    Chance
    T-storms

  • Juneteenth

    Juneteenth: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Heat index values as high as 97. Southwest wind 6 to 14 mph.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Southwest wind 9 to 11 mph, with gusts as high as 22 mph.

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of showers between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Patchy fog. Otherwise, cloudy, with a low around 66. Southeast wind 5 to 7 mph. Chance of precipitation is 40%.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Cloudy, with a high near 77. South wind 6 to 8 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 68. South wind around 6 mph.
Juneteenth
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Heat index values as high as 97. Southwest wind 6 to 14 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Southwest wind 9 to 11 mph, with gusts as high as 22 mph.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 65.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Mostly cloudy, with a low around 67.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 70.
Monday
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 72.
Tuesday
Sunny, with a high near 92.
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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:
3:10 pm EDT Jun 17, 2025
Forecast Valid:
5pm EDT Jun 17, 2025-6pm EDT Jun 24, 2025
 
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