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.

Overcast

43°F

6°C

Humidity 80%
Wind Speed S 7 mph
Barometer 30.20 in (1022.6 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 22 Apr 3:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Showers likely. Cloudy, with a low around 40. South wind around 10 mph. Chance of precipitation is 70%.

    Low: 40 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, mainly before 11am. Cloudy, with a high near 51. South wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F

    Showers
    Likely then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 67. Northwest wind 3 to 8 mph.

    High: 67 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45. North wind around 5 mph.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers. Partly sunny, with a high near 53.

    High: 53 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Chance
    Showers

Detailed Forecast

Overnight
Showers likely. Cloudy, with a low around 40. South wind around 10 mph. Chance of precipitation is 70%.
Wednesday
Showers likely, mainly before 11am. Cloudy, with a high near 51. South wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Mostly cloudy, with a low around 42. Calm wind.
Thursday
Mostly sunny, with a high near 67. Northwest wind 3 to 8 mph.
Thursday Night
Mostly cloudy, with a low around 45. North wind around 5 mph.
Friday
Partly sunny, with a high near 59.
Friday Night
Partly cloudy, with a low around 44.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 53.
Saturday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 41.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 58.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
A 50 percent chance of showers. Partly sunny, with a high near 57.
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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:
2:25 am EDT Apr 22, 2026
Forecast Valid:
4am EDT Apr 22, 2026-6pm EDT Apr 28, 2026
 
Forecast Discussion
 
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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