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.

Partly Cloudy

29°F

-2°C

Humidity 54%
Wind Speed W 16 G 24 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 19 Jan 4:56 pm EST
Extended Forecast for

Islip NY

  • M.L.King Day

    M.L.King Day: A chance of flurries. Partly sunny, with a high near 32. Wind chill values between 20 and 25. West wind around 15 mph, with gusts as high as 26 mph.

    High: 32 °F

    Chance
    Flurries

  • Tonight

    Tonight: A chance of flurries before 10pm. Mostly clear, with a low around 16. Wind chill values between 5 and 15. West wind 13 to 15 mph, with gusts as high as 29 mph.

    Low: 16 °F

    Chance
    Flurries

  • Tuesday

    Tuesday: Sunny, with a high near 23. Wind chill values between zero and 10. West wind 11 to 15 mph, with gusts as high as 28 mph.

    High: 23 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 13. Wind chill values between 5 and 10. West wind 6 to 11 mph, with gusts as high as 23 mph.

    Low: 13 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 39. West wind 5 to 13 mph becoming south in the afternoon. Winds could gust as high as 23 mph.

    High: 39 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a steady temperature around 37.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

Detailed Forecast

M.L.King Day
A chance of flurries. Partly sunny, with a high near 32. Wind chill values between 20 and 25. West wind around 15 mph, with gusts as high as 26 mph.
Tonight
A chance of flurries before 10pm. Mostly clear, with a low around 16. Wind chill values between 5 and 15. West wind 13 to 15 mph, with gusts as high as 29 mph.
Tuesday
Sunny, with a high near 23. Wind chill values between zero and 10. West wind 11 to 15 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly clear, with a low around 13. Wind chill values between 5 and 10. West wind 6 to 11 mph, with gusts as high as 23 mph.
Wednesday
Increasing clouds, with a high near 39. West wind 5 to 13 mph becoming south in the afternoon. Winds could gust as high as 23 mph.
Wednesday Night
Mostly cloudy, with a steady temperature around 37.
Thursday
Mostly sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 11.
Saturday
Mostly cloudy and cold, with a high near 20.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 9.
Sunday
A 30 percent chance of snow. Mostly cloudy and cold, with a high near 20.
Sunday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 10.
Monday
Partly sunny, with a high near 23.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
3:36 pm EST Jan 19, 2026
Forecast Valid:
5pm EST Jan 19, 2026-6pm EST Jan 26, 2026
 
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Additional Resources

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