Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

75°F

24°C

Humidity 84%
Wind Speed SW 7 mph
Barometer 29.97 in (1014.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 17 Aug 6:56 am EDT
Extended Forecast for

Ronkonkoma NY

  • Today

    Today: Mostly sunny, with a high near 88. South wind 6 to 13 mph.

    High: 88 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms between 8pm and 2am, then a slight chance of showers.  Mostly cloudy, with a low around 67. Southwest wind 6 to 14 mph becoming north after midnight.  Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers before 2pm.  Mostly cloudy, with a high near 75. Northeast wind 14 to 17 mph.

    High: 75 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 63. East wind 6 to 9 mph.

    Low: 63 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. East wind 9 to 13 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 2am.  Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers.  Partly sunny, with a high near 79.

    High: 79 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers.  Mostly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 88. South wind 6 to 13 mph.
Tonight
A chance of showers and thunderstorms between 8pm and 2am, then a slight chance of showers. Mostly cloudy, with a low around 67. Southwest wind 6 to 14 mph becoming north after midnight. Chance of precipitation is 40%.
Monday
A 20 percent chance of showers before 2pm. Mostly cloudy, with a high near 75. Northeast wind 14 to 17 mph.
Monday Night
Mostly cloudy, with a low around 63. East wind 6 to 9 mph.
Tuesday
Mostly sunny, with a high near 77. East wind 9 to 13 mph.
Tuesday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 65.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 79.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 65.
Friday
Sunny, with a high near 83.
Friday Night
Mostly clear, with a low around 67.
Saturday
Sunny, with a high near 83.
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ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
2:49 am EDT Aug 17, 2025
7am EDT Aug 17, 2025-6pm EDT Aug 23, 2025
 
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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