Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fog

43°F

6°C

Humidity 97%
Wind Speed SW 9 mph
Barometer 29.77 in (1008.0 mb)
Dewpoint 42°F (6°C)
Visibility 0.50 mi
Wind Chill38°F (3°C)
Last update 8 Mar 4:56 am EDT
Extended Forecast for

Port Jefferson NY

Dense Fog Advisory March 8, 06:12am until March 8, 09:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory March 8, 06:12am until March 8, 09:00am

    NOW until 9:00am Sun

    Dense Fog Advisory

  • Today

    High: 55 °F

    Chance
    Showers and
    Areas Dense
    Fog

  • Tonight

    Tonight: Partly cloudy, with a low around 41. West wind around 10 mph.

    Low: 41 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 54. Southwest wind 6 to 13 mph.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41. Southwest wind 6 to 10 mph.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 54. South wind 5 to 8 mph.

    High: 54 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 43 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 52.

    High: 52 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers after 2am.  Cloudy, with a low around 47. Breezy.

    Low: 47 °F

    Breezy.
    Cloudy then
    Chance
    Showers

Detailed Forecast

Today
A 40 percent chance of showers, mainly before 11am. Areas of dense fog before 11am. Otherwise, mostly cloudy, with a high near 55. West wind 10 to 14 mph.
Tonight
Partly cloudy, with a low around 41. West wind around 10 mph.
Monday
Sunny, with a high near 54. Southwest wind 6 to 13 mph.
Monday Night
Mostly clear, with a low around 41. Southwest wind 6 to 10 mph.
Tuesday
Mostly sunny, with a high near 54. South wind 5 to 8 mph.
Tuesday Night
Mostly cloudy, with a low around 43.
Wednesday
Cloudy, with a high near 52.
Wednesday Night
A 40 percent chance of showers after 2am. Cloudy, with a low around 47. Breezy.
Thursday
Showers likely, mainly after 8am. Cloudy, with a high near 51. Breezy. Chance of precipitation is 70%.
Thursday Night
Partly cloudy, with a low around 32. Breezy.
Friday
Mostly sunny, with a high near 43.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 39. Breezy.
Saturday
Mostly sunny, with a high near 47. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.96°N 73.08°W (Elev. 3 ft)
4:09 am EDT Mar 8, 2026
6am EDT Mar 8, 2026-6pm EDT Mar 14, 2026
 
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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