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.

Overcast

28°F

-2°C

Humidity 92%
Wind Speed W 7 mph
Barometer 29.81 in (1009.6 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 19 Jan 3:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • M.L.King Day

    M.L.King Day: Mostly cloudy, then gradually becoming sunny, with a high near 32. Wind chill values between 20 and 25. West wind 5 to 14 mph.

    High: 32 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly clear, with a low around 16. Wind chill values between 5 and 10. West wind around 11 mph, with gusts as high as 28 mph.

    Low: 16 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 22. Wind chill values between 5 and 10. West wind 10 to 14 mph, with gusts as high as 26 mph.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 12. Wind chill values between 5 and 10. West wind 5 to 8 mph, with gusts as high as 20 mph.

    Low: 12 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. Light west wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 31.

    High: 31 °F

    Partly Sunny

Detailed Forecast

M.L.King Day
Mostly cloudy, then gradually becoming sunny, with a high near 32. Wind chill values between 20 and 25. West wind 5 to 14 mph.
Tonight
Mostly clear, with a low around 16. Wind chill values between 5 and 10. West wind around 11 mph, with gusts as high as 28 mph.
Tuesday
Sunny, with a high near 22. Wind chill values between 5 and 10. West wind 10 to 14 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly clear, with a low around 12. Wind chill values between 5 and 10. West wind 5 to 8 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 38. Light west wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 41.
Thursday Night
Partly cloudy, with a low around 22.
Friday
Partly sunny, with a high near 31.
Friday Night
Mostly cloudy, with a low around 10.
Saturday
Mostly sunny, with a high near 21.
Saturday Night
Mostly cloudy, with a low around 6.
Sunday
A 30 percent chance of snow. Partly sunny and cold, with a high near 19.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
1:10 am EST Jan 19, 2026
Forecast Valid:
4am EST Jan 19, 2026-6pm EST Jan 25, 2026
 
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