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

80°F

27°C

Humidity 79%
Wind Speed SW 16 G 25 mph
Barometer 29.80 in (1009.0 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 3 Aug 5:56 pm EDT
Extended Forecast for

Ronkonkoma NY

High Surf Advisory August 3, 06:03pm until August 3, 09:00pm
Click here for hazard details and duration
...
  •  
    High Surf Advisory August 3, 06:03pm until August 3, 09:00pm

    NOW until 9:00pm Mon

    High Surf Advisory

  • Tonight

    Low: 64 °F

    Chance
    Showers then
    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 81. Northeast wind 5 to 9 mph becoming southeast in the afternoon.

    High: 81 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 66. Southeast wind 5 to 7 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 80. Light and variable wind becoming south 5 to 10 mph in the afternoon.

    High: 80 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 72. South wind 6 to 9 mph.

    Low: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm. Patchy fog after 4am. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 64. Southwest wind 6 to 13 mph becoming north after midnight. Chance of precipitation is 50%.
Tuesday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 81. Northeast wind 5 to 9 mph becoming southeast in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 66. Southeast wind 5 to 7 mph becoming calm in the evening.
Wednesday
Partly sunny, with a high near 80. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 72. South wind 6 to 9 mph.
Thursday
Mostly sunny, with a high near 85.
Thursday Night
A 30 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 73.
Friday
Mostly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 72.
Saturday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 85.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 72.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 72.
Monday
Mostly sunny, with a high near 86.
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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:
4:32 pm EDT Aug 3, 2026
Forecast Valid:
6pm EDT Aug 3, 2026-6pm EDT Aug 10, 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