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 45. Wind chill values between 25 and 35 early. West wind 7 to 11 mph, with gusts as high as 21 mph.

    High: 45 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of showers after 1am. Mostly cloudy, with a steady temperature around 41. Southwest wind 7 to 9 mph, with gusts as high as 22 mph.

    Low: 41 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm. Cloudy, with a high near 47. Southwest wind 6 to 9 mph.

    High: 47 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Cloudy, with a low around 29. Calm wind becoming west around 5 mph after midnight.

    Low: 29 °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 29 by 5pm. West wind 7 to 13 mph. Chance of precipitation is 20%.

    High: 38 °F⇓

    Slight Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 16.

    Low: 16 °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 26.

    Low: 26 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 45. Wind chill values between 25 and 35 early. West wind 7 to 11 mph, with gusts as high as 21 mph.
Tonight
A 20 percent chance of showers after 1am. Mostly cloudy, with a steady temperature around 41. Southwest wind 7 to 9 mph, with gusts as high as 22 mph.
Wednesday
A 20 percent chance of showers before 1pm. Cloudy, with a high near 47. Southwest wind 6 to 9 mph.
Wednesday Night
A 40 percent chance of rain. Cloudy, with a low around 29. Calm wind becoming west around 5 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 29 by 5pm. West wind 7 to 13 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 16.
Friday
Mostly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 26.
Saturday
Partly sunny, with a high near 41.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
Partly sunny, with a high near 37.
Sunday Night
Mostly cloudy, with a low around 22.
M.L.King Day
Partly sunny, with a high near 33.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°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
 
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Additional Resources

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