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.

Light Rain

69°F

21°C

Humidity 90%
Wind Speed Calm
Barometer 29.99 in (1015.5 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 28 Sep 2:56 am EDT
Extended Forecast for

Head of the Harbor NY

  • Overnight

    Overnight: Showers likely, mainly before 5am. Cloudy, with a steady temperature around 65. Calm wind. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Sunday

    Sunday: A 30 percent chance of showers before 8am. Cloudy through mid morning, then gradual clearing, with a high near 81. Calm wind becoming southwest around 6 mph in the morning.

    High: 81 °F

    Chance
    Showers then
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 63. Southwest wind around 6 mph becoming light and variable.

    Low: 63 °F

    Clear

  • Monday

    Monday: Increasing clouds, with a high near 78. Northeast wind around 6 mph.

    High: 78 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 77.

    High: 77 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers likely, mainly before 5am. Cloudy, with a steady temperature around 65. Calm wind. Chance of precipitation is 60%.
Sunday
A 30 percent chance of showers before 8am. Cloudy through mid morning, then gradual clearing, with a high near 81. Calm wind becoming southwest around 6 mph in the morning.
Sunday Night
Clear, with a low around 63. Southwest wind around 6 mph becoming light and variable.
Monday
Increasing clouds, with a high near 78. Northeast wind around 6 mph.
Monday Night
Mostly cloudy, with a low around 61. Calm wind.
Tuesday
Mostly cloudy, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 50.
Thursday
Sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 50.
Friday
Sunny, with a high near 69.
Friday Night
Mostly clear, with a low around 53.
Saturday
Sunny, with a high near 73.
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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:
1:40 am EDT Sep 28, 2025
Forecast Valid:
3am EDT Sep 28, 2025-6pm EDT Oct 4, 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