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

67°F

19°C

Humidity 91%
Wind Speed SW 3 mph
Barometer 30.01 in
Dewpoint 64°F (18°C)
Visibility 7.00 mi
Last update 6 Jan 6:55 pm CST
Extended Forecast for

Grand Isle LA

Dense Fog Advisory January 7, 12:00am until January 7, 10:00am
Click here for hazard details and duration
Dense Fog Advisory

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, increasing clouds, with a low around 65. Southwest wind around 5 mph.

    Low: 65 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Areas of fog before 9am. Otherwise, partly sunny, with a high near 71. West wind around 5 mph.

    High: 71 °F

    Areas Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog between 8pm and 4am. Otherwise, partly cloudy, with a low around 65. South wind 5 to 10 mph.

    Low: 65 °F

    Patchy Fog

  • Thursday

    Thursday: Mostly sunny, with a high near 72. South wind 10 to 15 mph.

    High: 72 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 67. South wind 10 to 15 mph. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 72. South wind around 15 mph.

    High: 72 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. South wind 10 to 15 mph. Chance of precipitation is 60%.

    Low: 63 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 69. Southwest wind around 15 mph becoming north in the afternoon. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers, mainly before midnight. Cloudy, with a low around 51. Breezy, with a north wind 15 to 25 mph.

    Low: 51 °F

    Chance
    Showers and
    Breezy

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, increasing clouds, with a low around 65. Southwest wind around 5 mph.
Wednesday
Areas of fog before 9am. Otherwise, partly sunny, with a high near 71. West wind around 5 mph.
Wednesday Night
Patchy fog between 8pm and 4am. Otherwise, partly cloudy, with a low around 65. South wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 72. South wind 10 to 15 mph.
Thursday Night
A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 67. South wind 10 to 15 mph. Chance of precipitation is 30%.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 72. South wind around 15 mph.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. South wind 10 to 15 mph. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 69. Southwest wind around 15 mph becoming north in the afternoon. Chance of precipitation is 60%.
Saturday Night
A chance of showers, mainly before midnight. Cloudy, with a low around 51. Breezy, with a north wind 15 to 25 mph.
Sunday
Mostly cloudy, with a high near 56. Breezy, with a north wind 20 to 25 mph.
Sunday Night
Mostly cloudy, with a low around 48. Breezy, with a northeast wind around 20 mph.
Monday
Partly sunny, with a high near 56. Breezy, with a northeast wind 10 to 20 mph.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 51. Northeast wind around 10 mph.
Tuesday
A slight chance of showers. Mostly cloudy, with a high near 59. Northeast wind 5 to 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:
5:41 pm CST Jan 6, 2026
Forecast Valid:
7pm CST Jan 6, 2026-6pm CST Jan 13, 2026
 
Forecast Discussion
 
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Additional Resources

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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