National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

39°F

4°C

Humidity 70%
Wind Speed S 17 G 30 mph
Barometer 30.23 in (1024.0 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 21 Jan 7:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A chance of rain and snow, mainly between 10pm and 1am. Mostly cloudy, with a steady temperature around 38. Southwest wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    Low: 38 °F

    Chance
    Rain/Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 44. West wind 9 to 14 mph, with gusts as high as 25 mph.

    High: 44 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25. West wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 35. Wind chill values between 20 and 25. West wind 6 to 13 mph, with gusts as high as 24 mph.

    High: 35 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 10. West wind around 11 mph, with gusts as high as 26 mph.

    Low: 10 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: Snow likely after 1am. Mostly cloudy, with a low around 10. Chance of precipitation is 60%.

    Low: 10 °F

    Mostly Cloudy
    then Snow
    Likely

  • Sunday

    Sunday: Snow. High near 25. Chance of precipitation is 90%.

    High: 25 °F

    Snow

  • Sunday Night

    Sunday Night: Snow. Low around 18. Chance of precipitation is 80%.

    Low: 18 °F

    Snow

Detailed Forecast

Tonight
A chance of rain and snow, mainly between 10pm and 1am. Mostly cloudy, with a steady temperature around 38. Southwest wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 44. West wind 9 to 14 mph, with gusts as high as 25 mph.
Thursday Night
Partly cloudy, with a low around 25. West wind 6 to 8 mph, with gusts as high as 20 mph.
Friday
Partly sunny, with a high near 35. Wind chill values between 20 and 25. West wind 6 to 13 mph, with gusts as high as 24 mph.
Friday Night
Partly cloudy, with a low around 10. West wind around 11 mph, with gusts as high as 26 mph.
Saturday
Partly sunny and cold, with a high near 18.
Saturday Night
Snow likely after 1am. Mostly cloudy, with a low around 10. Chance of precipitation is 60%.
Sunday
Snow. High near 25. Chance of precipitation is 90%.
Sunday Night
Snow. Low around 18. Chance of precipitation is 80%.
Monday
A 50 percent chance of snow. Mostly cloudy, with a high near 27.
Monday Night
Partly cloudy, with a low around 12.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 13.
Wednesday
Partly sunny, with a high near 27.
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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:
6:01 pm EST Jan 21, 2026
Forecast Valid:
8pm EST Jan 21, 2026-6pm EST Jan 28, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation