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.

Fair

51°F

11°C

Humidity 59%
Wind Speed W 7 mph
Barometer 29.91 in (1012.9 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 11 Nov 3:56 am EST
Extended Forecast for

Head of the Harbor NY

  • Veterans Day

    Veterans Day: Increasing clouds, with a high near 61. West wind 3 to 8 mph.

    High: 61 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Cloudy, then gradually becoming partly cloudy, with a low around 49. East wind 3 to 8 mph.

    Low: 49 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: A chance of rain and thunderstorms before 1pm, then rain likely and possibly a thunderstorm between 1pm and 4pm, then rain likely after 4pm. Mostly cloudy, with a high near 60. East wind 9 to 13 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 60 °F

    Chance Rain
    then Rain
    Likely

  • Thursday Night

    Thursday Night: Rain. Low around 44. North wind 13 to 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 44 °F

    Rain

  • Friday

    Friday: Rain. High near 51. North wind around 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 51 °F

    Rain

  • Friday Night

    Friday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

Detailed Forecast

Veterans Day
Increasing clouds, with a high near 61. West wind 3 to 8 mph.
Tonight
Cloudy, then gradually becoming partly cloudy, with a low around 49. East wind 3 to 8 mph.
Thursday
A chance of rain and thunderstorms before 1pm, then rain likely and possibly a thunderstorm between 1pm and 4pm, then rain likely after 4pm. Mostly cloudy, with a high near 60. East wind 9 to 13 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Rain. Low around 44. North wind 13 to 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain. High near 51. North wind around 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 38.
Saturday
Partly sunny, with a high near 49.
Saturday Night
Mostly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Partly cloudy, with a low around 37.
Monday
Sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Head of the Harbor NY
 40.9°N 73.18°W (Elev. 7 ft)
Last Update:
1:20 am EST Nov 11, 2026
Forecast Valid:
4am EST Nov 11, 2026-6pm EST Nov 17, 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