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.

Fair

55°F

13°C

Humidity 36%
Wind Speed NW 8 mph
Barometer 30.28 in (1025.3 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 11 Apr 7:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

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

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Patchy frost before 7am. Otherwise, increasing clouds, with a high near 54. Northeast wind 6 to 15 mph becoming south in the afternoon.

    High: 54 °F

    Patchy Frost
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 44. South wind around 15 mph.

    Low: 44 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 65. Breezy, with a southwest wind 14 to 20 mph, with gusts as high as 30 mph.

    High: 65 °F

    Partly Sunny
    and Breezy

  • Monday Night

    Monday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 54. West wind 8 to 18 mph.

    Low: 54 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Tuesday Night

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

    Low: 54 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 37. North wind 5 to 10 mph.
Sunday
Patchy frost before 7am. Otherwise, increasing clouds, with a high near 54. Northeast wind 6 to 15 mph becoming south in the afternoon.
Sunday Night
Mostly cloudy, with a low around 44. South wind around 15 mph.
Monday
Partly sunny, with a high near 65. Breezy, with a southwest wind 14 to 20 mph, with gusts as high as 30 mph.
Monday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 54. West wind 8 to 18 mph.
Tuesday
Partly sunny, with a high near 72.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 74.
Wednesday Night
Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 72.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 68.
Friday Night
Mostly cloudy, with a low around 49.
Saturday
Partly sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
6:36 pm EDT Apr 11, 2026
Forecast Valid:
8pm EDT Apr 11, 2026-6pm EDT Apr 18, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation