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.

Overcast

50°F

10°C

Humidity 83%
Wind Speed E 13 G 24 mph
Barometer 29.43 in (996.5 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 12 Nov 6:56 pm EST
Extended Forecast for

Head of the Harbor NY

  • Tonight

    Tonight: Showers before midnight, then rain after midnight. Low around 42. Breezy, with a northeast wind 14 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 42 °F

    Showers and
    Breezy

  • Friday

    Friday: Rain, mainly before 4pm. High near 47. Breezy, with a north wind 14 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 47 °F

    Rain and
    Breezy

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 35. North wind 7 to 9 mph.

    Low: 35 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 48. Northwest wind 8 to 11 mph.

    High: 48 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 35. Northwest wind 7 to 9 mph.

    Low: 35 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers before midnight, then rain after midnight. Low around 42. Breezy, with a northeast wind 14 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain, mainly before 4pm. High near 47. Breezy, with a north wind 14 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 30 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 35. North wind 7 to 9 mph.
Saturday
Partly sunny, with a high near 48. Northwest wind 8 to 11 mph.
Saturday Night
Partly cloudy, with a low around 35. Northwest wind 7 to 9 mph.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 35.
Tuesday
Sunny, with a high near 53.
Tuesday Night
Mostly clear, with a low around 37.
Wednesday
Sunny, with a high near 57.
Wednesday Night
Mostly clear, with a low around 39.
Thursday
Sunny, with a high near 59.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Head of the Harbor NY
 40.88°N 73.16°W (Elev. 148 ft)
Last Update:
5:04 pm EST Nov 12, 2026
Forecast Valid:
7pm EST Nov 12, 2026-6pm EST Nov 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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