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

54°F

12°C

Humidity 75%
Wind Speed SW 20 G 28 mph
Barometer 29.68 in (1005.1 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 26 Mar 8:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Showers, mainly after 11pm. Steady temperature around 53. Breezy, with a southwest wind 16 to 25 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 53 °F

    Breezy.
    Showers
    Likely then
    Showers

  • Friday

    Friday: Showers, mainly before 8am. Temperature falling to around 46 by 5pm. North wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F⇓

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 30. Northeast wind around 7 mph.

    Low: 30 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 11 to 14 mph.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 28. Northwest wind 5 to 9 mph becoming calm in the evening.

    Low: 28 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 53.

    High: 53 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers, mainly after 11pm. Steady temperature around 53. Breezy, with a southwest wind 16 to 25 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers, mainly before 8am. Temperature falling to around 46 by 5pm. North wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Mostly cloudy, with a low around 30. Northeast wind around 7 mph.
Saturday
Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 11 to 14 mph.
Saturday Night
Mostly clear, with a low around 28. Northwest wind 5 to 9 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 47.
Sunday Night
Mostly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 53.
Monday Night
Mostly cloudy, with a low around 43.
Tuesday
A 30 percent chance of rain after 8am. Mostly cloudy, with a high near 53.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 44.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 58.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 59.
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Forecast Area
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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:
7:31 pm EDT Mar 26, 2026
Forecast Valid:
9pm EDT Mar 26, 2026-6pm EDT Apr 2, 2026
 
Forecast Discussion
 
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Additional Resources

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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