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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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
6:12 am EDT Apr 21, 2026
6am EDT Apr 21, 2026-6pm EDT Apr 27, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database