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

57°F

14°C

Humidity 55%
Wind Speed SW 10 mph
Barometer 30.25 in (1024.3 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 2 Nov 3:56 pm EST
Extended Forecast for

Ronkonkoma NY

  • Tonight

    Tonight: Partly cloudy, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.

    Low: 44 °F

    Partly Cloudy

  • Monday

    Monday: A 50 percent chance of showers after 11am. Mostly cloudy, with a high near 62. South wind 6 to 13 mph.

    High: 62 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 46. Southwest wind 9 to 17 mph becoming northwest after midnight.

    Low: 46 °F

    Gradual
    Clearing

  • Tuesday

    Tuesday: Sunny, with a high near 60. Breezy, with a west wind 14 to 22 mph.

    High: 60 °F

    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 46. West wind 8 to 10 mph.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.
Monday
A 50 percent chance of showers after 11am. Mostly cloudy, with a high near 62. South wind 6 to 13 mph.
Monday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 46. Southwest wind 9 to 17 mph becoming northwest after midnight.
Tuesday
Sunny, with a high near 60. Breezy, with a west wind 14 to 22 mph.
Tuesday Night
Mostly clear, with a low around 46. West wind 8 to 10 mph.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 46.
Thursday
Sunny, with a high near 58.
Thursday Night
Partly cloudy, with a low around 40.
Friday
Partly sunny, with a high near 61.
Friday Night
Showers likely. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Saturday
Partly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 59.
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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:
12:53 pm EST Nov 2, 2025
Forecast Valid:
4pm EST Nov 2, 2025-6pm EST Nov 9, 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