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.

Light Rain Fog/Mist

68°F

20°C

Humidity 96%
Wind Speed E 13 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 67°F (19°C)
Visibility 3.00 mi
Last update 6 Jul 9:56 am EDT
Extended Forecast for

Commack NY

Flood Watch July 6, 10:36am until July 7, 06:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 6, 10:36am until July 7, 06:00am

    NOW until 6:00am Tue

    Flood Watch

  • Today

    High: 70 °F

    Heavy Rain

  • Tonight

    Tonight: Showers and possibly a thunderstorm. Low around 64. East wind 11 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

    Low: 64 °F

    Showers

  • Tuesday

    Tuesday: Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 72. Northeast wind around 14 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 63. Northeast wind 8 to 10 mph.

    Low: 63 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 81. North wind 6 to 8 mph.

    High: 81 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    Showers

Detailed Forecast

Today
Periods of showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 70. East wind around 14 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Tonight
Showers and possibly a thunderstorm. Low around 64. East wind 11 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Tuesday
Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 72. Northeast wind around 14 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 63. Northeast wind 8 to 10 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 81. North wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Mostly sunny, with a high near 89.
Thursday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 71.
Friday
A 40 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 71.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Commack NY
 40.85°N 73.28°W (Elev. 144 ft)
Last Update:
6:43 am EDT Jul 6, 2026
Forecast Valid:
10am EDT Jul 6, 2026-6pm EDT Jul 12, 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