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.

Rain Fog/Mist

37°F

3°C

Humidity 93%
Wind Speed E 15 mph
Barometer 30.25 in (1024.3 mb)
Dewpoint 35°F (2°C)
Visibility 3.00 mi
Wind Chill28°F (-2°C)
Last update 5 Mar 10:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Rain, mainly before 4am. Low around 34. Northeast wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 34 °F

    Rain

  • Friday

    Friday: A 30 percent chance of rain, mainly before 7am. Cloudy, with a high near 42. Northeast wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 42 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of rain after 1am. Patchy fog. Otherwise, cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Patchy Fog
    then Slight
    Chance Rain
    and Patchy
    Fog

  • Saturday

    Saturday: Cloudy, with a high near 48. Calm wind becoming south around 6 mph in the afternoon.

    High: 48 °F

    Cloudy

  • Saturday Night

    Saturday Night: Rain likely, mainly after 1am. Cloudy, with a temperature rising to around 46 by 4am. Southwest wind 5 to 7 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 43 °F⇑

    Rain Likely

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny, with a high near 56.

    High: 56 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Tonight
Rain, mainly before 4am. Low around 34. Northeast wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
A 30 percent chance of rain, mainly before 7am. Cloudy, with a high near 42. Northeast wind 6 to 10 mph, with gusts as high as 20 mph.
Friday Night
A 20 percent chance of rain after 1am. Patchy fog. Otherwise, cloudy, with a low around 34. Calm wind.
Saturday
Cloudy, with a high near 48. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
Rain likely, mainly after 1am. Cloudy, with a temperature rising to around 46 by 4am. Southwest wind 5 to 7 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 58.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 54.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 50.
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Forecast Area
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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:
1:01 pm EST Mar 5, 2026
Forecast Valid:
11pm EST Mar 5, 2026-6pm EDT Mar 12, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation