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

41°F

5°C

Humidity 53%
Wind Speed W 15 G 26 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 7 Dec 9:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Partly cloudy, with a low around 24. West wind 9 to 17 mph becoming northwest after midnight.

    Low: 24 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 32. Wind chill values between 15 and 20. North wind 14 to 18 mph, with gusts as high as 32 mph.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 17. North wind 5 to 9 mph.

    Low: 17 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 41. Wind chill values between 20 and 30. Light and variable wind becoming south 6 to 11 mph in the morning.

    High: 41 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A slight chance of rain and snow before 1am, then a slight chance of snow. Mostly cloudy, with a steady temperature around 37. Southwest wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 37 °F

    Slight Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 40 percent chance of rain. Mostly cloudy, with a high near 50. Breezy.

    High: 50 °F

    Chance Rain
    and Breezy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 24. West wind 9 to 17 mph becoming northwest after midnight.
Monday
Mostly sunny, with a high near 32. Wind chill values between 15 and 20. North wind 14 to 18 mph, with gusts as high as 32 mph.
Monday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 17. North wind 5 to 9 mph.
Tuesday
Increasing clouds, with a high near 41. Wind chill values between 20 and 30. Light and variable wind becoming south 6 to 11 mph in the morning.
Tuesday Night
A slight chance of rain and snow before 1am, then a slight chance of snow. Mostly cloudy, with a steady temperature around 37. Southwest wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 50. Breezy.
Wednesday Night
A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35.
Thursday
Mostly sunny, with a high near 44.
Thursday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 28.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 40.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 37.
Saturday Night
Partly cloudy, with a low around 22.
Sunday
Mostly sunny, with a high near 35.
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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:
5:39 pm EST Dec 7, 2025
Forecast Valid:
10pm EST Dec 7, 2025-6pm EST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation