National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

33°F

1°C

Humidity 72%
Wind Speed N 6 mph
Barometer 30.03 in (1017.2 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 5 Dec 8:56 pm EST
Extended Forecast for

Head of the Harbor NY

  • Tonight

    Tonight: A slight chance of snow before midnight, then a chance of freezing rain between midnight and 4am, then a chance of drizzle or freezing rain after 4am. Cloudy, with a steady temperature around 31. Calm wind. Chance of precipitation is 30%.

    Low: 31 °F

    Slight Chance
    Light Snow
    then Chance
    Drizzle/Freezing
    Rain

  • Saturday

    Saturday: A chance of drizzle before 1pm. Cloudy, with a high near 41. Calm wind becoming west around 6 mph in the morning.

    High: 41 °F

    Chance
    Drizzle

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Northwest wind around 7 mph.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 40. North wind around 6 mph becoming light and variable in the afternoon.

    High: 40 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 25. Light southwest wind becoming northwest 5 to 10 mph in the evening.

    Low: 25 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Monday

    Monday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of snow before midnight, then a chance of freezing rain between midnight and 4am, then a chance of drizzle or freezing rain after 4am. Cloudy, with a steady temperature around 31. Calm wind. Chance of precipitation is 30%.
Saturday
A chance of drizzle before 1pm. Cloudy, with a high near 41. Calm wind becoming west around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 29. Northwest wind around 7 mph.
Sunday
Partly sunny, with a high near 40. North wind around 6 mph becoming light and variable in the afternoon.
Sunday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 25. Light southwest wind becoming northwest 5 to 10 mph in the evening.
Monday
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 18.
Tuesday
Mostly sunny, with a high near 38.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 47.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 35.
Thursday
A 40 percent chance of rain. Partly sunny, with a high near 44.
Thursday Night
Mostly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 40.
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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:
9:17 pm EST Dec 5, 2025
Forecast Valid:
9pm EST Dec 5, 2025-6pm EST Dec 12, 2025
 
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