National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

54°F

12°C

Humidity 49%
Wind Speed N 16 G 28 mph
Barometer 30.18 in (1022.0 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 11 Apr 8:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Sunny, with a high near 61. Breezy, with a northwest wind 16 to 21 mph, with gusts as high as 31 mph.

    High: 61 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 37. North wind 5 to 10 mph becoming light after midnight.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 54. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 54 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 44. South wind 6 to 8 mph.

    Low: 44 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 63 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 52.

    Low: 52 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 74.

    High: 74 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 61. Breezy, with a northwest wind 16 to 21 mph, with gusts as high as 31 mph.
Tonight
Clear, with a low around 37. North wind 5 to 10 mph becoming light after midnight.
Sunday
Increasing clouds, with a high near 54. Calm wind becoming south 5 to 7 mph in the afternoon.
Sunday Night
Mostly cloudy, with a low around 44. South wind 6 to 8 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Monday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 52.
Tuesday
Partly sunny, with a high near 74.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 78.
Wednesday Night
Mostly cloudy, with a low around 58.
Thursday
Partly sunny, with a high near 76.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
Mostly cloudy, with a high near 66.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
9:18 am EDT Apr 11, 2026
Forecast Valid:
9am EDT Apr 11, 2026-6pm EDT Apr 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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