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

30°F

-1°C

Humidity 38%
Wind Speed W 6 mph
Barometer 30.13 in (1020.5 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 3 Feb 12:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 33. Wind chill values between 25 and 30. West wind around 9 mph.

    High: 33 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 16. Wind chill values between 5 and 10. West wind around 6 mph.

    Low: 16 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 32. Wind chill values between 5 and 15. Northwest wind 7 to 10 mph.

    High: 32 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14. Calm wind becoming north around 5 mph after midnight.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 29. North wind 6 to 9 mph.

    High: 29 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 13.

    Low: 13 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny

  • Friday Night

    Friday Night: Snow likely, mainly before 1am. Mostly cloudy, with a low around 12. Chance of precipitation is 60%.

    Low: 12 °F

    Snow Likely

  • Saturday

    Saturday: Mostly sunny, with a high near 21. Windy.

    High: 21 °F

    Mostly Sunny
    and Windy

Detailed Forecast

This Afternoon
Partly sunny, with a high near 33. Wind chill values between 25 and 30. West wind around 9 mph.
Tonight
Partly cloudy, with a low around 16. Wind chill values between 5 and 10. West wind around 6 mph.
Wednesday
Sunny, with a high near 32. Wind chill values between 5 and 15. Northwest wind 7 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 14. Calm wind becoming north around 5 mph after midnight.
Thursday
Sunny, with a high near 29. North wind 6 to 9 mph.
Thursday Night
Partly cloudy, with a low around 13.
Friday
Partly sunny, with a high near 29.
Friday Night
Snow likely, mainly before 1am. Mostly cloudy, with a low around 12. Chance of precipitation is 60%.
Saturday
Mostly sunny, with a high near 21. Windy.
Saturday Night
Mostly clear, with a low around 5. Blustery.
Sunday
Mostly sunny and cold, with a high near 19.
Sunday Night
Partly cloudy, with a low around 6.
Monday
Mostly sunny, with a high near 23.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
12:54 pm EST Feb 3, 2026
Forecast Valid:
1pm EST Feb 3, 2026-6pm EST Feb 9, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation