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

59°F

15°C

Humidity 87%
Wind Speed NE 7 mph
Barometer 30.14 in (1020.6 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 14 Jun 10:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A 20 percent chance of light rain. Cloudy, with a low around 58. Northeast wind around 9 mph.

    Low: 58 °F

    Slight Chance
    Light Rain

  • Sunday

    Sunday: Mostly cloudy, with a high near 67. Northeast wind around 10 mph.

    High: 67 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 57. East wind around 6 mph.

    Low: 57 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 70. East wind 8 to 10 mph.

    High: 70 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 59. East wind around 6 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 74.

    High: 74 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers before 8am. Mostly cloudy, with a high near 79.

    High: 79 °F

    Chance
    Showers then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of light rain. Cloudy, with a low around 58. Northeast wind around 9 mph.
Sunday
Mostly cloudy, with a high near 67. Northeast wind around 10 mph.
Sunday Night
Mostly cloudy, with a low around 57. East wind around 6 mph.
Monday
Mostly cloudy, with a high near 70. East wind 8 to 10 mph.
Monday Night
Mostly cloudy, with a low around 59. East wind around 6 mph becoming calm in the evening.
Tuesday
Mostly cloudy, with a high near 74.
Tuesday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 63.
Wednesday
A 30 percent chance of showers before 8am. Mostly cloudy, with a high near 79.
Wednesday Night
Mostly cloudy, with a low around 67.
Juneteenth
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 85.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 67.
Friday
Sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 64.
Saturday
Mostly sunny, with a high near 81.
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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:
9:07 pm EDT Jun 14, 2025
Forecast Valid:
11pm EDT Jun 14, 2025-6pm EDT Jun 21, 2025
 
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