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.

Light Rain

61°F

16°C

Humidity 84%
Wind Speed NW 7 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 10 May 11:56 pm EDT
Extended Forecast for

Ronkonkoma NY

  • Overnight

    Overnight: Scattered showers. Mostly cloudy, with a low around 51. North wind around 11 mph. Chance of precipitation is 30%.

    Low: 51 °F

    Scattered
    Showers

  • Monday

    Monday: Mostly cloudy, with a high near 63. North wind 6 to 10 mph.

    High: 63 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Cloudy during the early evening, then clearing, with a low around 46. Southwest wind 5 to 8 mph becoming north after midnight.

    Low: 46 °F

    Clearing

  • Tuesday

    Tuesday: Sunny, with a high near 66. North wind 7 to 10 mph.

    High: 66 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 50. Southwest wind around 8 mph.

    Low: 50 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Breezy.

    High: 63 °F

    Mostly Cloudy
    then Chance
    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers, mainly after 8pm. Low around 52. Chance of precipitation is 90%.

    Low: 52 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly before noon. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.

    High: 66 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Scattered showers. Mostly cloudy, with a low around 51. North wind around 11 mph. Chance of precipitation is 30%.
Monday
Mostly cloudy, with a high near 63. North wind 6 to 10 mph.
Monday Night
Cloudy during the early evening, then clearing, with a low around 46. Southwest wind 5 to 8 mph becoming north after midnight.
Tuesday
Sunny, with a high near 66. North wind 7 to 10 mph.
Tuesday Night
Increasing clouds, with a low around 50. Southwest wind around 8 mph.
Wednesday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Breezy.
Wednesday Night
Showers, mainly after 8pm. Low around 52. Chance of precipitation is 90%.
Thursday
Showers likely, mainly before noon. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.
Thursday Night
Mostly cloudy, with a low around 51.
Friday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 70.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Mostly sunny, with a high near 75.
Saturday Night
Partly cloudy, with a low around 56.
Sunday
Mostly sunny, with a high near 77.
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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:
2:37 am EDT May 11, 2026
Forecast Valid:
2am EDT May 11, 2026-6pm EDT May 17, 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