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.

Mostly Cloudy

49°F

9°C

Humidity 80%
Wind Speed SW 9 mph
Barometer 29.97 in (1014.9 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 26 Mar 9:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Mostly sunny, with a high near 59. Southwest wind around 14 mph, with gusts as high as 25 mph.

    High: 59 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers, mainly after 11pm. Low around 44. South wind 14 to 17 mph becoming west after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 44 °F

    Showers
    Likely then
    Showers

  • Friday

    Friday: Showers likely, mainly before 8am. Cloudy, with a steady temperature around 48. North wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of rain before 11pm, then a chance of rain and snow between 11pm and 2am, then a chance of snow after 2am. Mostly cloudy, with a low around 30. North wind 5 to 8 mph. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: Mostly sunny, with a high near 41. North wind around 15 mph.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 56.

    High: 56 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 59. Southwest wind around 14 mph, with gusts as high as 25 mph.
Tonight
Showers, mainly after 11pm. Low around 44. South wind 14 to 17 mph becoming west after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers likely, mainly before 8am. Cloudy, with a steady temperature around 48. North wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of rain before 11pm, then a chance of rain and snow between 11pm and 2am, then a chance of snow after 2am. Mostly cloudy, with a low around 30. North wind 5 to 8 mph. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 41. North wind around 15 mph.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Mostly sunny, with a high near 47.
Sunday Night
Mostly cloudy, with a low around 37.
Monday
Mostly cloudy, with a high near 56.
Monday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 43.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 53.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 39.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 53.
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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:
5:42 am EDT Mar 26, 2026
Forecast Valid:
10am EDT Mar 26, 2026-6pm EDT Apr 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation