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

38°F

3°C

Humidity 55%
Wind Speed W 8 mph
Barometer 30.09 in (1018.8 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 13 Jan 8:56 am EST
Extended Forecast for

Islip NY

  • Today

    Today: Increasing clouds, with a high near 45. South wind 7 to 11 mph, with gusts as high as 22 mph.

    High: 45 °F

    Increasing
    Clouds

  • Tonight

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

    Low: 42 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Cloudy, with a high near 47. Southwest wind 6 to 9 mph.

    High: 47 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Cloudy, with a low around 30. Calm wind becoming west around 6 mph after midnight.

    Low: 30 °F

    Chance Rain

  • Thursday

    Thursday: A slight chance of rain and snow 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 8 to 14 mph. Chance of precipitation is 20%.

    High: 39 °F⇓

    Slight Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 17.

    Low: 17 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 28.

    Low: 28 °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. South wind 7 to 11 mph, with gusts as high as 22 mph.
Tonight
A 20 percent chance of showers after 1am. Mostly cloudy, with a steady temperature around 42. Southwest wind around 10 mph, with gusts as high as 23 mph.
Wednesday
Cloudy, with a high near 47. Southwest wind 6 to 9 mph.
Wednesday Night
A 50 percent chance of rain. Cloudy, with a low around 30. Calm wind becoming west around 6 mph after midnight.
Thursday
A slight chance of rain and snow 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 8 to 14 mph. Chance of precipitation is 20%.
Thursday Night
Mostly clear, with a low around 17.
Friday
Mostly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 28.
Saturday
Partly sunny, with a high near 41.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
Partly sunny, with a high near 38.
Sunday Night
Mostly cloudy, with a low around 23.
M.L.King Day
Partly sunny, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
5:50 am EST Jan 13, 2026
Forecast Valid:
9am EST Jan 13, 2026-6pm EST Jan 19, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation