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

41°F

5°C

Humidity 57%
Wind Speed SW 8 mph
Barometer 30.02 in (1016.7 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 7 Dec 5:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 24. Wind chill values between 15 and 20. West wind 8 to 16 mph becoming northwest after midnight.

    Low: 24 °F

    Decreasing
    Clouds

  • Monday

    Monday: Partly sunny, with a high near 30. Wind chill values between 15 and 20. North wind 10 to 16 mph, with gusts as high as 29 mph.

    High: 30 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 16. North wind around 6 mph becoming calm after midnight.

    Low: 16 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 41. Wind chill values between 20 and 30. Calm wind becoming south 5 to 9 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 low around 31. Southwest wind 9 to 11 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 31 °F

    Slight Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 40 percent chance of rain. Mostly cloudy, with a high near 49.

    High: 49 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 24. Wind chill values between 15 and 20. West wind 8 to 16 mph becoming northwest after midnight.
Monday
Partly sunny, with a high near 30. Wind chill values between 15 and 20. North wind 10 to 16 mph, with gusts as high as 29 mph.
Monday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 16. North wind around 6 mph becoming calm after midnight.
Tuesday
Increasing clouds, with a high near 41. Wind chill values between 20 and 30. Calm wind becoming south 5 to 9 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 low around 31. Southwest wind 9 to 11 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 49.
Wednesday Night
A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 34.
Thursday
Mostly sunny, with a high near 43.
Thursday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 27.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 38.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 24. Chance of precipitation is 30%.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 36.
Saturday Night
Partly cloudy, with a low around 21.
Sunday
Mostly sunny, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
5:39 pm EST Dec 7, 2025
Forecast Valid:
6pm EST Dec 7, 2025-6pm EST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation