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.

A Few Clouds

38°F

3°C

Humidity 86%
Wind Speed Calm
Barometer 30.24 in (1023.9 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 2 Nov 5:56 am EST
Extended Forecast for

Ronkonkoma NY

  • Today

    Today: Sunny, with a high near 59. Northwest wind 5 to 9 mph becoming southwest in the afternoon.

    High: 59 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 46. South wind around 5 mph becoming calm in the evening.

    Low: 46 °F

    Partly Cloudy

  • Monday

    Monday: A 40 percent chance of rain after 1pm. Partly sunny, with a high near 62. South wind 5 to 15 mph.

    High: 62 °F

    Partly Sunny
    then Chance
    Rain

  • Monday Night

    Monday Night: A 20 percent chance of rain before 1am. Mostly cloudy, then gradually becoming clear, with a low around 47. Southwest wind 13 to 16 mph becoming northwest after midnight. Winds could gust as high as 26 mph.

    Low: 47 °F

    Slight Chance
    Rain

  • Tuesday

    Tuesday: Sunny, with a high near 62. Northwest wind 15 to 18 mph, with gusts as high as 28 mph.

    High: 62 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 59. Northwest wind 5 to 9 mph becoming southwest in the afternoon.
Tonight
Partly cloudy, with a low around 46. South wind around 5 mph becoming calm in the evening.
Monday
A 40 percent chance of rain after 1pm. Partly sunny, with a high near 62. South wind 5 to 15 mph.
Monday Night
A 20 percent chance of rain before 1am. Mostly cloudy, then gradually becoming clear, with a low around 47. Southwest wind 13 to 16 mph becoming northwest after midnight. Winds could gust as high as 26 mph.
Tuesday
Sunny, with a high near 62. Northwest wind 15 to 18 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly clear, with a low around 46.
Wednesday
Partly sunny, with a high near 63.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 58.
Thursday Night
Mostly clear, with a low around 40.
Friday
Partly sunny, with a high near 61.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 49.
Saturday
A 40 percent chance of rain. Mostly sunny, with a high near 63.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
4:17 am EST Nov 2, 2025
Forecast Valid:
6am EST Nov 2, 2025-6pm EST Nov 8, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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