National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

Fair

75°F

24°C

Humidity 72%
Wind Speed S 10 mph
Barometer 30.03 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 27 Dec 3:55 pm CST
Extended Forecast for

Grand Isle LA

Dense Fog Advisory December 28, 12:00am until December 28, 10:00am
Click here for hazard details and duration
Dense Fog Advisory

  • Tonight

    Tonight: Areas of dense fog after 5am. Otherwise, partly cloudy, with a low around 67. South wind 5 to 10 mph.

    Low: 67 °F

    Mostly Cloudy
    then Areas
    Dense Fog

  • Sunday

    Sunday: A 20 percent chance of showers after 5pm. Widespread dense fog, mainly before 7am. Otherwise, sunny, with a high near 72. South wind around 10 mph.

    High: 72 °F

    Dense Fog
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Showers likely, with thunderstorms also possible after 3am. Patchy fog between 7pm and 9pm. Otherwise, mostly cloudy, with a low around 55. South wind 10 to 15 mph becoming west after midnight. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Showers
    Likely and
    Patchy Fog

  • Monday

    Monday: A 30 percent chance of showers before noon. Partly sunny, with a high near 65. Breezy, with a north wind 15 to 25 mph, with gusts as high as 35 mph.

    High: 65 °F

    Breezy.
    Chance
    Showers then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41. Windy, with a north wind 25 to 30 mph.

    Low: 41 °F

    Partly Cloudy
    and Windy

  • Tuesday

    Tuesday: Sunny, with a high near 50. Breezy, with a north wind 20 to 25 mph decreasing to 15 to 20 mph in the afternoon.

    High: 50 °F

    Sunny and
    Breezy then
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 43. North wind 10 to 15 mph.

    Low: 43 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 54. North wind 5 to 10 mph becoming light in the afternoon.

    High: 54 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 48. Calm wind becoming west around 5 mph.

    Low: 48 °F

    Mostly Clear

Detailed Forecast

Tonight
Areas of dense fog after 5am. Otherwise, partly cloudy, with a low around 67. South wind 5 to 10 mph.
Sunday
A 20 percent chance of showers after 5pm. Widespread dense fog, mainly before 7am. Otherwise, sunny, with a high near 72. South wind around 10 mph.
Sunday Night
Showers likely, with thunderstorms also possible after 3am. Patchy fog between 7pm and 9pm. Otherwise, mostly cloudy, with a low around 55. South wind 10 to 15 mph becoming west after midnight. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
A 30 percent chance of showers before noon. Partly sunny, with a high near 65. Breezy, with a north wind 15 to 25 mph, with gusts as high as 35 mph.
Monday Night
Partly cloudy, with a low around 41. Windy, with a north wind 25 to 30 mph.
Tuesday
Sunny, with a high near 50. Breezy, with a north wind 20 to 25 mph decreasing to 15 to 20 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 43. North wind 10 to 15 mph.
Wednesday
Sunny, with a high near 54. North wind 5 to 10 mph becoming light in the afternoon.
Wednesday Night
Mostly clear, with a low around 48. Calm wind becoming west around 5 mph.
New Year's Day
Sunny, with a high near 60. Northwest wind around 5 mph becoming southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 55. South wind 5 to 10 mph becoming southeast after midnight.
Friday
Partly sunny, with a high near 64. Southeast wind around 10 mph.
Friday Night
Mostly cloudy, with a low around 58. Southeast wind around 10 mph.
Saturday
A slight chance of showers. Mostly sunny, with a high near 66. South wind around 10 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
11:33 am CST Dec 27, 2025
Forecast Valid:
4pm CST Dec 27, 2025-6pm CST Jan 3, 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