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.

Partly Cloudy

46°F

8°C

Humidity 83%
Wind Speed SE 6 mph
Barometer 29.96 in (1014.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 11 Mar 6:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 65. South wind 5 to 14 mph.

    High: 65 °F

    Partly Sunny
    then Chance
    Showers

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 5am. Areas of fog. Otherwise, mostly cloudy, with a low around 41. South wind around 15 mph, with gusts as high as 26 mph.

    Low: 41 °F

    Chance
    Showers and
    Areas Fog

  • Thursday

    Thursday: Rain showers likely before 2pm, then a chance of rain and snow showers. Cloudy, with a temperature rising to near 51 by 9am, then falling to around 42 during the remainder of the day. Northwest wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    High: 51 °F⇓

    Showers
    Likely then
    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Northwest wind 7 to 10 mph.

    Low: 30 °F

    Decreasing
    Clouds

  • Friday

    Friday: Increasing clouds, with a high near 46. West wind 6 to 11 mph becoming south 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 46 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 36.

    Low: 36 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

  • Sunday

    Sunday: Cloudy, with a high near 48.

    High: 48 °F

    Cloudy

Detailed Forecast

Today
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 65. South wind 5 to 14 mph.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 5am. Areas of fog. Otherwise, mostly cloudy, with a low around 41. South wind around 15 mph, with gusts as high as 26 mph.
Thursday
Rain showers likely before 2pm, then a chance of rain and snow showers. Cloudy, with a temperature rising to near 51 by 9am, then falling to around 42 during the remainder of the day. Northwest wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Northwest wind 7 to 10 mph.
Friday
Increasing clouds, with a high near 46. West wind 6 to 11 mph becoming south 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 36.
Saturday
Sunny, with a high near 48.
Saturday Night
Mostly cloudy, with a low around 30.
Sunday
Cloudy, with a high near 48.
Sunday Night
Showers likely, mainly after 2am. Cloudy, with a low around 40. Chance of precipitation is 70%.
Monday
Showers. High near 54. Breezy. Chance of precipitation is 90%.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 30.
Tuesday
Mostly sunny, with a high near 40.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
5:42 am EDT Mar 11, 2026
Forecast Valid:
7am EDT Mar 11, 2026-6pm EDT Mar 17, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation