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.

Partly Cloudy

62°F

17°C

Humidity 86%
Wind Speed NW 8 mph
Barometer 29.85 in (1010.8 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 12 Oct 8:56 pm EDT
Extended Forecast for

Ronkonkoma NY

  • Tonight

    Tonight: Patchy fog. Otherwise, partly cloudy, with a low around 55. Northwest wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Patchy Fog

  • Tuesday

    Tuesday: Mostly sunny, with a high near 70. East wind 6 to 11 mph becoming south in the afternoon.

    High: 70 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, then gradually becoming clear, with a low around 63. Southwest wind 11 to 13 mph, with gusts as high as 23 mph.

    Low: 63 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Increasing clouds, with a high near 78. West wind around 11 mph.

    High: 78 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 54. North wind 8 to 10 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers after 2am. Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers, mainly after 8am. High near 69. Chance of precipitation is 80%.

    High: 69 °F

    Showers

  • Friday Night

    Friday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 45. Breezy. Chance of precipitation is 60%.

    Low: 45 °F

    Breezy.
    Showers
    Likely then
    Chance
    Showers

Detailed Forecast

Tonight
Patchy fog. Otherwise, partly cloudy, with a low around 55. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 70. East wind 6 to 11 mph becoming south in the afternoon.
Tuesday Night
Mostly cloudy, then gradually becoming clear, with a low around 63. Southwest wind 11 to 13 mph, with gusts as high as 23 mph.
Wednesday
Increasing clouds, with a high near 78. West wind around 11 mph.
Wednesday Night
Mostly cloudy, with a low around 54. North wind 8 to 10 mph.
Thursday
Sunny, with a high near 65.
Thursday Night
A 50 percent chance of showers after 2am. Partly cloudy, with a low around 51.
Friday
Showers, mainly after 8am. High near 69. Chance of precipitation is 80%.
Friday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 45. Breezy. Chance of precipitation is 60%.
Saturday
Mostly sunny, with a high near 55. Breezy.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 44.
Monday
Mostly sunny, with a high near 63.
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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:
2:47 pm EDT Oct 12, 2026
Forecast Valid:
9pm EDT Oct 12, 2026-6pm EDT Oct 19, 2026
 
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