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

46°F

8°C

Humidity 63%
Wind Speed S 10 mph
Barometer 30.09 in (1019.1 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 28 Feb 11:56 am EST
Extended Forecast for

Head of the Harbor NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a temperature falling to around 41 by 5pm. South wind around 9 mph.

    High: 44 °F⇓

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 28. Calm wind becoming north 5 to 8 mph after midnight.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Snow likely, mainly between 10am and 4pm. Increasing clouds, with a high near 36. Wind chill values between 25 and 30. North wind 7 to 9 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 36 °F

    Snow Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before 7pm. Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind 9 to 15 mph.

    Low: 15 °F

    Chance Snow
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 27. North wind 5 to 8 mph.

    High: 27 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

  • Tuesday

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

    High: 40 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: Rain. Low around 35. Chance of precipitation is 90%.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 45.

    High: 45 °F

    Chance Rain

Detailed Forecast

This Afternoon
Mostly sunny, with a temperature falling to around 41 by 5pm. South wind around 9 mph.
Tonight
Partly cloudy, with a low around 28. Calm wind becoming north 5 to 8 mph after midnight.
Sunday
Snow likely, mainly between 10am and 4pm. Increasing clouds, with a high near 36. Wind chill values between 25 and 30. North wind 7 to 9 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Sunday Night
A 30 percent chance of snow before 7pm. Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind 9 to 15 mph.
Monday
Sunny, with a high near 27. North wind 5 to 8 mph.
Monday Night
Mostly clear, with a low around 18.
Tuesday
A 50 percent chance of rain after 1pm. Mostly cloudy, with a high near 40.
Tuesday Night
Rain. Low around 35. Chance of precipitation is 90%.
Wednesday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 45.
Wednesday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 33.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 46.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 38.
Friday
A 30 percent chance of rain. Cloudy, with a high near 48.
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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:
9:41 am EST Feb 28, 2026
Forecast Valid:
12pm EST Feb 28, 2026-6pm EST Mar 6, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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