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.

Light Drizzle Fog

38°F

3°C

Humidity 97%
Wind Speed S 7 mph
Barometer 30.25 in (1024.3 mb)
Dewpoint 37°F (3°C)
Visibility 0.50 mi
Wind Chill33°F (1°C)
Last update 7 Mar 8:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Dense Fog Advisory until March 7, 10:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory until March 7, 10:00am

    NOW until 10:00am Sat

    Dense Fog Advisory

  • Today

    High: 45 °F

    Areas Drizzle
    and Areas Fog

  • Tonight

    Tonight: A 50 percent chance of showers after 10pm. Areas of fog before 1am. Otherwise, cloudy, with a temperature rising to around 48 by 4am. Southwest wind 9 to 13 mph.

    Low: 43 °F⇑

    Chance
    Showers and
    Areas Fog

  • Sunday

    Sunday: A 40 percent chance of rain. Cloudy, with a high near 59. Southwest wind 9 to 11 mph.

    High: 59 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. West wind 3 to 6 mph.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57. Light southwest wind increasing to 6 to 11 mph in the morning.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Today
Areas of drizzle before 1pm. Areas of fog. Otherwise, cloudy, with a high near 45. Light south wind increasing to 5 to 9 mph in the morning.
Tonight
A 50 percent chance of showers after 10pm. Areas of fog before 1am. Otherwise, cloudy, with a temperature rising to around 48 by 4am. Southwest wind 9 to 13 mph.
Sunday
A 40 percent chance of rain. Cloudy, with a high near 59. Southwest wind 9 to 11 mph.
Sunday Night
Mostly clear, with a low around 39. West wind 3 to 6 mph.
Monday
Sunny, with a high near 57. Light southwest wind increasing to 6 to 11 mph in the morning.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Partly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 43.
Wednesday
A 40 percent chance of rain before 1pm. Cloudy, with a high near 56.
Wednesday Night
Rain likely, mainly after 1am. Cloudy, with a low around 43. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Cloudy, with a high near 51.
Thursday Night
Partly cloudy, with a low around 28.
Friday
Partly sunny, with a high near 43.
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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:
2:47 am EST Mar 7, 2026
Forecast Valid:
9am EST Mar 7, 2026-6pm EDT Mar 13, 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