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

46°F

8°C

Humidity 38%
Wind Speed N 7 mph
Barometer 30.27 in (1024.9 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 1 Dec 12:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 42. Northwest wind 7 to 10 mph.

    High: 42 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 28. Light and variable wind.

    Low: 28 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Rain. High near 48. Southeast wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

    High: 48 °F

    Rain

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 29. Wind chill values between 20 and 25. Northwest wind around 10 mph, with gusts as high as 28 mph.

    Low: 29 °F

    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 40. Northwest wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 40 °F

    Sunny

  • Wednesday Night

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

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 42. Northwest wind 7 to 10 mph.
Tonight
Increasing clouds, with a low around 28. Light and variable wind.
Tuesday
Rain. High near 48. Southeast wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Tuesday Night
A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 29. Wind chill values between 20 and 25. Northwest wind around 10 mph, with gusts as high as 28 mph.
Wednesday
Sunny, with a high near 40. Northwest wind 6 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 42.
Thursday Night
Mostly clear, with a low around 19.
Friday
Mostly sunny, with a high near 37.
Friday Night
A 50 percent chance of snow after 10pm. Mostly cloudy, with a low around 28.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.
Saturday Night
A chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.
Sunday
Partly sunny, with a high near 43.
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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:
10:02 am EST Dec 1, 2025
Forecast Valid:
1pm EST Dec 1, 2025-6pm EST Dec 7, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation