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

62°F

17°C

Humidity 90%
Wind Speed NE 7 mph
Barometer 30.15 in (1020.8 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 16 Jun 7:56 am EDT
Extended Forecast for

Ronkonkoma NY

  • Today

    Today: A 20 percent chance of light rain after 2pm. Mostly cloudy, with a high near 69. East wind around 10 mph.

    High: 69 °F

    Mostly Cloudy
    then Slight
    Chance Light
    Rain

  • Tonight

    Tonight: A slight chance of light rain before 8pm, then a slight chance of light rain after 2am. Mostly cloudy, with a low around 61. East wind 5 to 8 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Mostly Cloudy
    then Slight
    Chance Light
    Rain

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 73. East wind 7 to 10 mph.

    High: 73 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Cloudy, with a low around 65. Southeast wind around 6 mph becoming calm in the evening.

    Low: 65 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 81. Southwest wind 5 to 9 mph. Chance of precipitation is 30%.

    High: 81 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers between 8pm and 2am. Partly cloudy, with a low around 69. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of light rain after 2pm. Mostly cloudy, with a high near 69. East wind around 10 mph.
Tonight
A slight chance of light rain before 8pm, then a slight chance of light rain after 2am. Mostly cloudy, with a low around 61. East wind 5 to 8 mph. Chance of precipitation is 20%.
Tuesday
Mostly cloudy, with a high near 73. East wind 7 to 10 mph.
Tuesday Night
A 50 percent chance of showers. Cloudy, with a low around 65. Southeast wind around 6 mph becoming calm in the evening.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 81. Southwest wind 5 to 9 mph. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 69.
Juneteenth
Sunny, with a high near 87.
Thursday Night
A chance of showers between 8pm and 2am. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
Friday
Sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 65.
Saturday
Sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
6:40 pm EDT Jun 15, 2025
Forecast Valid:
8am EDT Jun 16, 2025-6pm EDT Jun 22, 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