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.

A Few Clouds

29°F

-2°C

Humidity 82%
Wind Speed Calm
Barometer 30.09 in (1019.0 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 14 Feb 8:56 pm EST
Extended Forecast for

Head of the Harbor NY

  • Tonight

    Tonight: Mostly clear, with a low around 26. Calm wind.

    Low: 26 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 36. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Snow likely, mainly after 1am. Cloudy, with a low around 28. East wind 5 to 7 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    Low: 28 °F

    Snow Likely

  • Washington's Birthday

    Washington's Birthday: A 20 percent chance of snow before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 37. Wind chill values between 20 and 30. Northeast wind 5 to 8 mph.

    High: 37 °F

    Slight Chance
    Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of rain after 1pm. Mostly cloudy, with a high near 40.

    High: 40 °F

    Cloudy then
    Chance Rain

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 26. Calm wind.
Sunday
Increasing clouds, with a high near 36. Calm wind becoming northeast around 6 mph in the afternoon.
Sunday Night
Snow likely, mainly after 1am. Cloudy, with a low around 28. East wind 5 to 7 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Washington's Birthday
A 20 percent chance of snow before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 37. Wind chill values between 20 and 30. Northeast wind 5 to 8 mph.
Monday Night
Mostly cloudy, with a low around 28. Calm wind.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 50 percent chance of rain after 1pm. Mostly cloudy, with a high near 40.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 33.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 43.
Thursday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Friday
A 50 percent chance of rain. Mostly cloudy, with a high near 41.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 30.
Saturday
A 30 percent chance of rain. Mostly cloudy, with a high near 40.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Head of the Harbor NY
 40.9°N 73.15°W (Elev. 157 ft)
Last Update:
7:04 pm EST Feb 14, 2026
Forecast Valid:
9pm EST Feb 14, 2026-6pm EST Feb 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation