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

29°F

-2°C

Humidity 61%
Wind Speed W 6 mph
Barometer 30.12 in (1019.9 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 4 Jan 7:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 22. Northwest wind 3 to 7 mph.

    Low: 22 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of light snow between 10am and 4pm. Increasing clouds, with a high near 38. Wind chill values between 20 and 30. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 20%.

    High: 38 °F

    Slight Chance
    Light Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31. South wind around 6 mph becoming calm in the evening.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 44. Calm wind becoming east 5 to 7 mph in the afternoon.

    High: 44 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of light rain. Mostly cloudy, with a low around 35. East wind around 6 mph becoming west after midnight.

    Low: 35 °F

    Chance Light
    Rain

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 47.

    High: 47 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 22. Northwest wind 3 to 7 mph.
Monday
A slight chance of light snow between 10am and 4pm. Increasing clouds, with a high near 38. Wind chill values between 20 and 30. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 31. South wind around 6 mph becoming calm in the evening.
Tuesday
Mostly cloudy, with a high near 44. Calm wind becoming east 5 to 7 mph in the afternoon.
Tuesday Night
A 40 percent chance of light rain. Mostly cloudy, with a low around 35. East wind around 6 mph becoming west after midnight.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Mostly clear, with a low around 32.
Thursday
Sunny, with a high near 47.
Thursday Night
Mostly cloudy, with a low around 36.
Friday
A 50 percent chance of rain. Cloudy, with a high near 51.
Friday Night
Rain likely. Cloudy, with a low around 40. Chance of precipitation is 60%.
Saturday
Rain likely. Mostly cloudy, with a high near 51. Chance of precipitation is 60%.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 44. Breezy.
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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:
3:08 pm EST Jan 4, 2026
Forecast Valid:
8pm EST Jan 4, 2026-6pm EST Jan 11, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation