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.

Mostly Cloudy

71°F

22°C

Humidity 90%
Wind Speed S 5 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 26 Aug 11:56 pm EDT
Extended Forecast for

Ronkonkoma NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 69. South wind around 8 mph.

    Low: 69 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 11am. Partly sunny, with a high near 81. South wind 10 to 16 mph.

    High: 81 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 69. South wind 6 to 11 mph becoming light after midnight.

    Low: 69 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 8am, then a slight chance of showers after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the morning. Chance of precipitation is 20%.

    High: 83 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Southwest wind 5 to 8 mph becoming north after midnight.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 69. South wind around 8 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 11am. Partly sunny, with a high near 81. South wind 10 to 16 mph.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 69. South wind 6 to 11 mph becoming light after midnight.
Friday
A slight chance of showers before 8am, then a slight chance of showers after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the morning. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 64. Southwest wind 5 to 8 mph becoming north after midnight.
Saturday
Mostly sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 68.
Monday
Mostly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 68.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 82.
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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:
2:53 pm EDT Aug 26, 2026
Forecast Valid:
12am EDT Aug 27, 2026-6pm EDT Sep 2, 2026
 
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