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.

Mostly Cloudy

45°F

7°C

Humidity 54%
Wind Speed W 12 mph
Barometer 30.17 in (1021.5 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 28 Mar 5:56 am EDT
Extended Forecast for

Ronkonkoma NY

  • Today

    Today: Partly sunny, with a high near 60. Southwest wind 9 to 11 mph, with gusts as high as 21 mph.

    High: 60 °F

    Partly Sunny

  • Tonight

    Tonight: Showers likely, mainly between 11pm and 2am. Mostly cloudy, with a low around 47. South wind around 8 mph. Chance of precipitation is 60%.

    Low: 47 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly sunny, with a high near 73. Southwest wind 9 to 16 mph.

    High: 73 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 44. Southwest wind 8 to 11 mph becoming east after midnight.

    Low: 44 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly cloudy, with a high near 56. East wind 10 to 14 mph.

    High: 56 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 50 percent chance of showers. Patchy fog after 2am. Otherwise, cloudy, with a low around 46.

    Low: 46 °F

    Chance
    Showers and
    Patchy Fog

  • Monday

    Monday: Showers likely, mainly after noon. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 62. Breezy. Chance of precipitation is 60%.

    High: 62 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    Likely and
    Breezy

  • Monday Night

    Monday Night: Showers likely, mainly before midnight. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.

    Low: 43 °F

    Showers
    Likely then
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 60. Southwest wind 9 to 11 mph, with gusts as high as 21 mph.
Tonight
Showers likely, mainly between 11pm and 2am. Mostly cloudy, with a low around 47. South wind around 8 mph. Chance of precipitation is 60%.
Saturday
Mostly sunny, with a high near 73. Southwest wind 9 to 16 mph.
Saturday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 44. Southwest wind 8 to 11 mph becoming east after midnight.
Sunday
Mostly cloudy, with a high near 56. East wind 10 to 14 mph.
Sunday Night
A 50 percent chance of showers. Patchy fog after 2am. Otherwise, cloudy, with a low around 46.
Monday
Showers likely, mainly after noon. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 62. Breezy. Chance of precipitation is 60%.
Monday Night
Showers likely, mainly before midnight. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.
Tuesday
Mostly sunny, with a high near 54.
Tuesday Night
Mostly clear, with a low around 33.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 38.
Thursday
A 40 percent chance of showers. Mostly cloudy, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
4:05 am EDT Mar 28, 2025
Forecast Valid:
6am EDT Mar 28, 2025-6pm EDT Apr 3, 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