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.

Partly Cloudy

79°F

26°C

Humidity 58%
Wind Speed W 10 mph
Barometer 30.02 in (1016.3 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 12 Jun 8:56 am EDT
Extended Forecast for

Ronkonkoma NY

  • Today

    Today: Sunny, with a high near 87. West wind 11 to 13 mph.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 11pm, then a chance of showers after 2am. Mostly cloudy, with a low around 63. West wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 30%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers, mainly before 8am. Partly sunny, with a high near 76. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 76 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 62. East wind 6 to 8 mph.

    Low: 62 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers. Cloudy, with a high near 69. Northeast wind 9 to 13 mph.

    High: 69 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers. Cloudy, with a low around 60.

    Low: 60 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 72.

    High: 72 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers. Cloudy, with a low around 61.

    Low: 61 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers. Mostly cloudy, with a high near 72.

    High: 72 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 87. West wind 11 to 13 mph.
Tonight
A slight chance of showers and thunderstorms before 11pm, then a chance of showers after 2am. Mostly cloudy, with a low around 63. West wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers, mainly before 8am. Partly sunny, with a high near 76. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Friday Night
A 50 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 62. East wind 6 to 8 mph.
Saturday
A 50 percent chance of showers. Cloudy, with a high near 69. Northeast wind 9 to 13 mph.
Saturday Night
A 30 percent chance of showers. Cloudy, with a low around 60.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 72.
Sunday Night
A 30 percent chance of showers. Cloudy, with a low around 61.
Monday
A 30 percent chance of showers. Mostly cloudy, with a high near 72.
Monday Night
Mostly cloudy, with a low around 62.
Tuesday
Mostly cloudy, with a high near 76.
Tuesday Night
Mostly cloudy, with a low around 64.
Wednesday
Mostly sunny, with a high near 78.
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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:
3:53 am EDT Jun 12, 2025
Forecast Valid:
9am EDT Jun 12, 2025-6pm EDT Jun 18, 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