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

41°F

5°C

Humidity 41%
Wind Speed W 13 G 26 mph
Barometer 29.88 in (1011.8 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 27 Nov 8:56 pm EST
Extended Forecast for

Head of the Harbor NY

  • Tonight

    Tonight: Mostly clear, with a low around 31. Wind chill values between 25 and 30. West wind around 14 mph, with gusts as high as 24 mph.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 42. Wind chill values between 20 and 30. Breezy, with a west wind 15 to 21 mph, with gusts as high as 40 mph.

    High: 42 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 32. Wind chill values between 25 and 30. West wind 14 to 18 mph, with gusts as high as 36 mph.

    Low: 32 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 42. Wind chill values between 25 and 35. West wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 42 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 33. Calm wind becoming southeast around 5 mph after midnight.

    Low: 33 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain likely after 1pm. Cloudy, with a high near 50. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 50 °F

    Cloudy then
    Rain Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

  • Monday

    Monday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 31. Wind chill values between 25 and 30. West wind around 14 mph, with gusts as high as 24 mph.
Friday
Mostly sunny, with a high near 42. Wind chill values between 20 and 30. Breezy, with a west wind 15 to 21 mph, with gusts as high as 40 mph.
Friday Night
Mostly clear, with a low around 32. Wind chill values between 25 and 30. West wind 14 to 18 mph, with gusts as high as 36 mph.
Saturday
Sunny, with a high near 42. Wind chill values between 25 and 35. West wind 6 to 10 mph, with gusts as high as 21 mph.
Saturday Night
Increasing clouds, with a low around 33. Calm wind becoming southeast around 5 mph after midnight.
Sunday
Rain likely after 1pm. Cloudy, with a high near 50. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35.
Monday
Partly sunny, with a high near 42.
Monday Night
Mostly cloudy, with a low around 30.
Tuesday
Rain likely, mainly after 1pm. Cloudy, with a high near 44. Chance of precipitation is 60%.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 32.
Wednesday
Partly sunny, with a high near 41.
Wednesday Night
Partly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Head of the Harbor NY
 40.9°N 73.15°W (Elev. 157 ft)
Last Update:
5:33 pm EST Nov 27, 2025
Forecast Valid:
9pm EST Nov 27, 2025-6pm EST Dec 4, 2025
 
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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