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 and Breezy

50°F

10°C

Humidity 57%
Wind Speed N 21 G 33 mph
Barometer 29.92 in (1013.2 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 16 Oct 8:56 am EDT
Extended Forecast for

Head of the Harbor NY

  • Today

    Today: Sunny, with a high near 57. North wind 14 to 16 mph, with gusts as high as 26 mph.

    High: 57 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 44. North wind 13 to 15 mph, with gusts as high as 25 mph.

    Low: 44 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 61. North wind around 11 mph.

    High: 61 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 45. North wind 6 to 9 mph.

    Low: 45 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 63. North wind around 5 mph becoming light and variable in the afternoon.

    High: 63 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Showers likely after 8pm. Mostly cloudy, with a low around 53. Chance of precipitation is 70%.

    Low: 53 °F

    Showers
    Likely

  • Monday

    Monday: A 40 percent chance of showers. Partly sunny, with a high near 66.

    High: 66 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 57. North wind 14 to 16 mph, with gusts as high as 26 mph.
Tonight
Clear, with a low around 44. North wind 13 to 15 mph, with gusts as high as 25 mph.
Friday
Sunny, with a high near 61. North wind around 11 mph.
Friday Night
Mostly clear, with a low around 45. North wind 6 to 9 mph.
Saturday
Sunny, with a high near 63. North wind around 5 mph becoming light and variable in the afternoon.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
Mostly sunny, with a high near 69.
Sunday Night
Showers likely after 8pm. Mostly cloudy, with a low around 53. Chance of precipitation is 70%.
Monday
A 40 percent chance of showers. Partly sunny, with a high near 66.
Monday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 52.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 66.
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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:
1:38 am EDT Oct 16, 2025
Forecast Valid:
9am EDT Oct 16, 2025-6pm EDT Oct 22, 2025
 
Forecast Discussion
 
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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