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.

Fair

33°F

1°C

Humidity 61%
Wind Speed W 6 mph
Barometer 30.09 in (1018.8 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 13 Jan 5:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Increasing clouds, with a high near 47. Wind chill values between 25 and 35 early. West wind 7 to 13 mph.

    High: 47 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of showers after 1am. Mostly cloudy, with a steady temperature around 42. Southwest wind 10 to 13 mph, with gusts as high as 23 mph.

    Low: 42 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm. Cloudy, with a high near 49. Southwest wind 7 to 10 mph.

    High: 49 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Cloudy, with a low around 31. Calm wind becoming west around 6 mph after midnight.

    Low: 31 °F

    Chance Rain

  • Thursday

    Thursday: A slight chance of rain before 10am, then a slight chance of snow between 10am and 1pm. Partly sunny, with a temperature falling to around 32 by 5pm. West wind 10 to 16 mph. Chance of precipitation is 20%.

    High: 39 °F⇓

    Slight Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 47. Wind chill values between 25 and 35 early. West wind 7 to 13 mph.
Tonight
A 20 percent chance of showers after 1am. Mostly cloudy, with a steady temperature around 42. Southwest wind 10 to 13 mph, with gusts as high as 23 mph.
Wednesday
A 20 percent chance of showers before 1pm. Cloudy, with a high near 49. Southwest wind 7 to 10 mph.
Wednesday Night
A 50 percent chance of rain. Cloudy, with a low around 31. Calm wind becoming west around 6 mph after midnight.
Thursday
A slight chance of rain before 10am, then a slight chance of snow between 10am and 1pm. Partly sunny, with a temperature falling to around 32 by 5pm. West wind 10 to 16 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 17.
Friday
Mostly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 27.
Saturday
Partly sunny, with a high near 43.
Saturday Night
Mostly cloudy, with a low around 28.
Sunday
Partly sunny, with a high near 39.
Sunday Night
Mostly cloudy, with a low around 23.
M.L.King Day
Partly sunny, with a high near 34.
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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:
5:50 am EST Jan 13, 2026
Forecast Valid:
6am EST Jan 13, 2026-6pm EST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation