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.

28°F

-2°C

Humidity 58%
Wind Speed NW 10 mph
Barometer 29.75 in (1007.4 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 24 Feb 1:56 am EST
Extended Forecast for

Head of the Harbor NY

  • Overnight

    Overnight: Patchy blowing snow. Partly cloudy, with a low around 21. Wind chill values between 15 and 20. Northwest wind around 10 mph.

    Low: 21 °F

    Patchy
    Blowing Snow

  • Tuesday

    Tuesday: Mostly sunny, with a high near 29. Wind chill values between 10 and 20. Northwest wind 9 to 11 mph.

    High: 29 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of snow after 4am. Increasing clouds, with a temperature falling to near 19 by 10pm, then rising to around 31 during the remainder of the night. Wind chill values between 10 and 15. Light and variable wind becoming south 5 to 7 mph after midnight.

    Low: 19 °F⇑

    Partly Cloudy
    then Chance
    Snow

  • Wednesday

    Wednesday: Snow likely, possibly mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Wind chill values between 25 and 30. Southwest wind around 11 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Rain/Snow
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. Southwest wind 6 to 8 mph.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after 1pm. Partly sunny, with a high near 37. Chance of precipitation is 50%.

    High: 37 °F

    Partly Sunny
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 60%.

    Low: 28 °F

    Snow Likely

  • Friday

    Friday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy blowing snow. Partly cloudy, with a low around 21. Wind chill values between 15 and 20. Northwest wind around 10 mph.
Tuesday
Mostly sunny, with a high near 29. Wind chill values between 10 and 20. Northwest wind 9 to 11 mph.
Tuesday Night
A 50 percent chance of snow after 4am. Increasing clouds, with a temperature falling to near 19 by 10pm, then rising to around 31 during the remainder of the night. Wind chill values between 10 and 15. Light and variable wind becoming south 5 to 7 mph after midnight.
Wednesday
Snow likely, possibly mixing with rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 39. Wind chill values between 25 and 30. Southwest wind around 11 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 29. Southwest wind 6 to 8 mph.
Thursday
A chance of rain and snow after 1pm. Partly sunny, with a high near 37. Chance of precipitation is 50%.
Thursday Night
Snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 36.
Friday Night
Partly cloudy, with a low around 27.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Mostly sunny, with a high near 38.
Sunday Night
Partly cloudy, with a low around 17.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 29.
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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:
1:15 am EST Feb 24, 2026
Forecast Valid:
2am EST Feb 24, 2026-6pm EST Mar 2, 2026
 
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Additional Resources

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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