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

42°F

6°C

Humidity 51%
Wind Speed NW 13 mph
Barometer 30.02 in (1016.7 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 3 Dec 12:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 43. Northwest wind 7 to 10 mph.

    High: 43 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. Wind chill values between 25 and 30. West wind 5 to 10 mph.

    Low: 30 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 43. Wind chill values between 25 and 35. West wind 11 to 18 mph, with gusts as high as 32 mph.

    High: 43 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 18. Wind chill values between 10 and 15. Northwest wind 7 to 17 mph, with gusts as high as 34 mph.

    Low: 18 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of light snow after 1pm. Increasing clouds, with a high near 35. North wind 5 to 9 mph becoming south in the afternoon.

    High: 35 °F

    Mostly Sunny
    then Slight
    Chance Light
    Snow

  • Friday Night

    Friday Night: A chance of snow before 4am, then a chance of rain. Cloudy, with a low around 28. Chance of precipitation is 30%.

    Low: 28 °F

    Chance Light
    Snow then
    Chance
    Rain/Snow

  • Saturday

    Saturday: A chance of rain or light rain before 7am, then a chance of rain between 7am and 1pm. Partly sunny, with a high near 42. Chance of precipitation is 30%.

    High: 42 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 43. Northwest wind 7 to 10 mph.
Tonight
Mostly clear, with a low around 30. Wind chill values between 25 and 30. West wind 5 to 10 mph.
Thursday
Increasing clouds, with a high near 43. Wind chill values between 25 and 35. West wind 11 to 18 mph, with gusts as high as 32 mph.
Thursday Night
Mostly clear, with a low around 18. Wind chill values between 10 and 15. Northwest wind 7 to 17 mph, with gusts as high as 34 mph.
Friday
A 20 percent chance of light snow after 1pm. Increasing clouds, with a high near 35. North wind 5 to 9 mph becoming south in the afternoon.
Friday Night
A chance of snow before 4am, then a chance of rain. Cloudy, with a low around 28. Chance of precipitation is 30%.
Saturday
A chance of rain or light rain before 7am, then a chance of rain between 7am and 1pm. Partly sunny, with a high near 42. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Mostly sunny, with a high near 44.
Sunday Night
Mostly cloudy, with a low around 25.
Monday
Mostly sunny, with a high near 34.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 38.
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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:
12:40 pm EST Dec 3, 2025
Forecast Valid:
1pm EST Dec 3, 2025-6pm EST Dec 9, 2025
 
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Additional Resources

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