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.

Fair

33°F

1°C

Humidity 52%
Wind Speed N 7 mph
Barometer 30.34 in (1027.5 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 21 Apr 5:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

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

    NOW until 9:00am Tue

    Freeze Warning

  • Today

    High: 51 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Showers likely, mainly after 2am. Increasing clouds, with a low around 39. South wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, mainly before 2pm. Cloudy, with a high near 54. South wind 9 to 11 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 54 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the morning.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Today
Increasing clouds, with a high near 51. North wind 5 to 7 mph becoming south in the afternoon.
Tonight
Showers likely, mainly after 2am. Increasing clouds, with a low around 39. South wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Showers likely, mainly before 2pm. Cloudy, with a high near 54. South wind 9 to 11 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Mostly cloudy, with a low around 44. Calm wind.
Thursday
Mostly sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 59.
Friday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 43.
Saturday
A 50 percent chance of showers. Mostly cloudy, with a high near 54.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 42.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 56.
Sunday Night
Mostly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 58.
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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:
6:12 am EDT Apr 21, 2026
Forecast Valid:
6am EDT Apr 21, 2026-6pm EDT Apr 27, 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