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

49°F

9°C

Humidity 27%
Wind Speed NW 16 G 23 mph
Barometer 30.17 in (1021.6 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 20 Apr 5:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Freeze Warning April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Freeze Warning

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 31. North wind 7 to 16 mph.

    Low: 31 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 51. North wind 5 to 7 mph becoming south in the afternoon.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 2am. Increasing clouds, with a low around 38. South wind 9 to 11 mph.

    Low: 38 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 40 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 56. South wind 10 to 14 mph.

    High: 56 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43. Light east wind.

    Low: 43 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Friday Night

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

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 31. North wind 7 to 16 mph.
Tuesday
Sunny, with a high near 51. North wind 5 to 7 mph becoming south in the afternoon.
Tuesday Night
A 20 percent chance of showers after 2am. Increasing clouds, with a low around 38. South wind 9 to 11 mph.
Wednesday
A 40 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 56. South wind 10 to 14 mph.
Wednesday Night
Mostly cloudy, with a low around 43. Light east wind.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
Mostly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 44.
Saturday
A 40 percent chance of showers after 8am. Mostly cloudy, with a high near 56.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 45.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 58.
Sunday Night
Mostly cloudy, with a low around 44.
Monday
Partly sunny, with a high near 60.
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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:
6:38 pm EDT Apr 20, 2026
Forecast Valid:
6pm EDT Apr 20, 2026-6pm EDT Apr 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation