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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy and Breezy

51°F

11°C

Humidity 27%
Wind Speed W 24 G 41 mph
Barometer 30.02 in (1016.6 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 14 Mar 3:56 pm EDT
Extended Forecast for

Commack NY

  • Tonight

    Tonight: Increasing clouds, with a low around 32. Northwest wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 29 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 49. East wind 5 to 11 mph becoming southeast in the afternoon.

    High: 49 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Showers, mainly after 2am. Temperature falling to near 40 by 9pm, then rising to around 48 during the remainder of the night. Southeast wind 9 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F⇑

    Slight Chance
    Showers then
    Showers

  • Monday

    Monday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 59. Breezy, with a south wind 17 to 22 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 59 °F

    Heavy Rain
    and Breezy

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 33. Windy, with a south wind 20 to 29 mph, with gusts as high as 49 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 33 °F

    Heavy Rain
    and Windy

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 42.

    High: 42 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 32. Northwest wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 29 mph.
Sunday
Partly sunny, with a high near 49. East wind 5 to 11 mph becoming southeast in the afternoon.
Sunday Night
Showers, mainly after 2am. Temperature falling to near 40 by 9pm, then rising to around 48 during the remainder of the night. Southeast wind 9 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 59. Breezy, with a south wind 17 to 22 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 33. Windy, with a south wind 20 to 29 mph, with gusts as high as 49 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 42.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 45.
Thursday Night
Mostly cloudy, with a low around 33.
Friday
Mostly sunny, with a high near 49.
Friday Night
A 30 percent chance of rain. Partly cloudy, with a low around 34.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 48.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Commack NY
 40.85°N 73.28°W (Elev. 144 ft)
Last Update:
2:22 pm EDT Mar 14, 2026
Forecast Valid:
4pm EDT Mar 14, 2026-6pm EDT Mar 21, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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