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.

Mostly Cloudy

27°C

81°F

Humidity 69%
Wind Speed S 13 km/h
Barometer 1019.1 mb (30.10 in)
Dewpoint 21°C (70°F)
Visibility 16 km
Heat Index29°C (84°F)
Last update 13 Jul 11:56 am EDT
Extended Forecast for

Commack NY

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 27. Southeast wind around 11 km/h.

    High: 27 °C

    Partly Sunny

  • Tonight

    Tonight: Patchy drizzle and fog after 10pm. Mostly cloudy, with a low around 22. Southeast wind 5 to 11 km/h.

    Low: 22 °C

    Patchy
    Drizzle and
    Patchy Fog

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 29. Southeast wind 8 to 11 km/h.

    High: 29 °C

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23. South wind 5 to 10 km/h.

    Low: 23 °C

    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 31. South wind 5 to 10 km/h.

    High: 31 °C

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 23.

    Low: 23 °C

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 32.

    High: 32 °C

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 23.

    Low: 23 °C

    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 32.

    High: 32 °C

    Partly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Partly sunny, with a high near 27. Southeast wind around 11 km/h.
Tonight
Patchy drizzle and fog after 10pm. Mostly cloudy, with a low around 22. Southeast wind 5 to 11 km/h.
Monday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 29. Southeast wind 8 to 11 km/h.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23. South wind 5 to 10 km/h.
Tuesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 31. South wind 5 to 10 km/h.
Tuesday Night
Partly cloudy, with a low around 23.
Wednesday
Mostly sunny, with a high near 32.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 23.
Thursday
A 40 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 32.
Thursday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 40%.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 33.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 23.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Commack NY
 40.85°N 73.28°W (Elev. 144 m)
Last Update:
6:52 am EDT Jul 13, 2025
Forecast Valid:
12pm EDT Jul 13, 2025-6pm EDT Jul 19, 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