National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

67°F

19°C

Humidity 66%
Wind Speed SW 3 mph
Barometer 30.06 in (1017.9 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 23 Aug 1:56 am EDT
Extended Forecast for

Ronkonkoma NY

High Surf Advisory August 23, 02:55am until August 23, 04:00am
Click here for hazard details and duration
High Surf Advisory
  •  
    High Surf Advisory August 23, 02:55am until August 23, 04:00am

    NOW until 4:00am Sat

    High Surf Advisory

  • Overnight

    Low: 64 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 82. South wind 6 to 13 mph.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65. South wind 9 to 11 mph.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 80. South wind 8 to 14 mph.

    High: 80 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 69. South wind 6 to 10 mph.

    Low: 69 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers. Partly sunny, with a high near 83.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

Overnight
Clear, with a low around 64. Southwest wind around 6 mph.
Saturday
Sunny, with a high near 82. South wind 6 to 13 mph.
Saturday Night
Mostly clear, with a low around 65. South wind 9 to 11 mph.
Sunday
Partly sunny, with a high near 80. South wind 8 to 14 mph.
Sunday Night
A 40 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 69. South wind 6 to 10 mph.
Monday
A 40 percent chance of showers. Partly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 61.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Mostly sunny, with a high near 80.
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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:
2:03 am EDT Aug 23, 2025
Forecast Valid:
2am EDT Aug 23, 2025-6pm EDT Aug 29, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation