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

45°F

7°C

Humidity 83%
Wind Speed NE 13 mph
Barometer 30.11 in (1019.7 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 26 Apr 10:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Partly sunny, with a high near 54. Northeast wind around 14 mph.

    High: 54 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 42. East wind around 6 mph becoming light and variable.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 63. North wind around 10 mph.

    High: 63 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 44. Northeast wind 3 to 6 mph.

    Low: 44 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 62. Northeast wind 6 to 10 mph becoming east in the afternoon.

    High: 62 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 58.

    High: 58 °F

    Partly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers, mainly after 8pm. Low around 46. Chance of precipitation is 80%.

    Low: 46 °F

    Showers

  • Thursday

    Thursday: Showers, mainly before 8am. High near 57. Chance of precipitation is 80%.

    High: 57 °F

    Showers then
    Chance
    Showers

Detailed Forecast

Today
Partly sunny, with a high near 54. Northeast wind around 14 mph.
Tonight
Mostly clear, with a low around 42. East wind around 6 mph becoming light and variable.
Monday
Sunny, with a high near 63. North wind around 10 mph.
Monday Night
Mostly clear, with a low around 44. Northeast wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 62. Northeast wind 6 to 10 mph becoming east in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 44.
Wednesday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 58.
Wednesday Night
Showers, mainly after 8pm. Low around 46. Chance of precipitation is 80%.
Thursday
Showers, mainly before 8am. High near 57. Chance of precipitation is 80%.
Thursday Night
Mostly cloudy, with a low around 43.
Friday
Partly sunny, with a high near 55.
Friday Night
Mostly cloudy, with a low around 42.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 56.
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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:
6:53 am EDT Apr 26, 2026
Forecast Valid:
11am EDT Apr 26, 2026-6pm EDT May 2, 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