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.

Fog/Mist

52°F

11°C

Humidity 100%
Wind Speed SW 9 mph
Barometer 29.79 in (1008.7 mb)
Dewpoint 52°F (11°C)
Visibility 0.75 mi
Wind Chill49°F (9°C)
Last update 8 Mar 12:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Dense Fog Advisory March 8, 01:44pm until March 8, 02:00pm
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory March 8, 01:44pm until March 8, 02:00pm

    NOW until 2:00pm Sun

    Dense Fog Advisory

  • This Afternoon

    High: 56 °F

    Chance
    Showers and
    Areas Dense
    Fog

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 38. West wind 3 to 5 mph.

    Low: 38 °F

    Decreasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 56. Calm wind becoming southwest 5 to 9 mph in the afternoon.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39. South wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 55. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 55 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 54.

    High: 54 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after 2am. Cloudy, with a low around 44.

    Low: 44 °F

    Cloudy then
    Chance
    Showers

Detailed Forecast

This Afternoon
A 50 percent chance of showers before 3pm. Areas of dense fog. Otherwise, mostly cloudy, with a high near 56. West wind around 10 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 38. West wind 3 to 5 mph.
Monday
Sunny, with a high near 56. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 39. South wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 55. Calm wind becoming south 5 to 7 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Cloudy, with a high near 54.
Wednesday Night
A 30 percent chance of showers after 2am. Cloudy, with a low around 44.
Thursday
Showers likely, mainly after 8am. Cloudy, with a high near 52. Chance of precipitation is 70%.
Thursday Night
Partly cloudy, with a low around 29.
Friday
Mostly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 36.
Saturday
Mostly sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
11:48 am EDT Mar 8, 2026
Forecast Valid:
1pm EDT Mar 8, 2026-6pm EDT Mar 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation