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.

A Few Clouds

36°F

2°C

Humidity 52%
Wind Speed W 17 G 30 mph
Barometer 29.88 in (1011.9 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 11 Jan 9:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 28. Wind chill values between 20 and 25. West wind around 14 mph, with gusts as high as 36 mph.

    Low: 28 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind around 11 mph, with gusts as high as 26 mph.

    High: 41 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30. West wind around 7 mph.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 44. Southwest wind 6 to 9 mph.

    High: 44 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 39. South wind around 7 mph, with gusts as high as 21 mph.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 47.

    High: 47 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Cloudy, with a low around 34.

    Low: 34 °F

    Cloudy then
    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Mostly cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.

    Low: 22 °F

    Chance
    Rain/Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 28. Wind chill values between 20 and 25. West wind around 14 mph, with gusts as high as 36 mph.
Monday
Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind around 11 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 30. West wind around 7 mph.
Tuesday
Sunny, with a high near 44. Southwest wind 6 to 9 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 39. South wind around 7 mph, with gusts as high as 21 mph.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
A 30 percent chance of rain after 1am. Cloudy, with a low around 34.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
Thursday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
A 40 percent chance of rain. Partly sunny, with a high near 36.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
1:42 pm EST Jan 11, 2026
Forecast Valid:
10pm EST Jan 11, 2026-6pm EST Jan 18, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation