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

39°F

4°C

Humidity 60%
Wind Speed SW 16 G 25 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 9 Dec 8:56 pm EST
Extended Forecast for

Head of the Harbor NY

  • Tonight

    Tonight: Mostly cloudy, with a steady temperature around 33. Wind chill values between 25 and 30. Southwest wind around 11 mph, with gusts as high as 21 mph.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain, mainly after 10am. High near 47. Wind chill values between 25 and 35 early. South wind 11 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 47 °F

    Slight Chance
    Rain then
    Rain

  • Wednesday Night

    Wednesday Night: Rain, mainly before 7pm. Low around 31. Wind chill values between 25 and 30. Southwest wind around 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.

    Low: 31 °F

    Rain then
    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a steady temperature around 34. Wind chill values between 20 and 25. Breezy, with a west wind 17 to 20 mph, with gusts as high as 36 mph.

    High: 34 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24. Breezy, with a west wind 14 to 20 mph, with gusts as high as 33 mph.

    Low: 24 °F

    Partly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of light snow after 1am. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Light Snow

  • Saturday

    Saturday: Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Mostly cloudy, with a steady temperature around 33. Wind chill values between 25 and 30. Southwest wind around 11 mph, with gusts as high as 21 mph.
Wednesday
Rain, mainly after 10am. High near 47. Wind chill values between 25 and 35 early. South wind 11 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain, mainly before 7pm. Low around 31. Wind chill values between 25 and 30. Southwest wind around 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.
Thursday
Mostly sunny, with a steady temperature around 34. Wind chill values between 20 and 25. Breezy, with a west wind 17 to 20 mph, with gusts as high as 36 mph.
Thursday Night
Partly cloudy, with a low around 24. Breezy, with a west wind 14 to 20 mph, with gusts as high as 33 mph.
Friday
Mostly sunny, with a high near 37.
Friday Night
A 30 percent chance of light snow after 1am. Mostly cloudy, with a low around 26.
Saturday
Mostly cloudy, with a high near 41.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 29.
Sunday
A chance of snow, mixing with rain after 9am, then gradually ending. Partly sunny, with a high near 38. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 19.
Monday
Mostly sunny, with a high near 31.
Monday Night
Mostly cloudy, with a low around 22.
Tuesday
Mostly sunny, with a high near 34.
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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:
5:42 pm EST Dec 9, 2025
Forecast Valid:
9pm EST Dec 9, 2025-6pm EST Dec 16, 2025
 
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Additional Resources

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High Temperature

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Chance of Precipitation