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

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

Partly Cloudy

74°F

23°C

Humidity 89%
Wind Speed SE 3 mph
Barometer 30.08 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 10 Mar 9:35 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Mostly cloudy, with a low around 70. Southeast wind 10 to 15 mph.

    Low: 70 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Patchy fog between 8am and 9am. Otherwise, partly sunny, with a high near 75. Southeast wind 10 to 15 mph.

    High: 75 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Patchy fog between midnight and 3am. Low around 61. Breezy, with a south wind 10 to 20 mph becoming west after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 61 °F

    Showers then
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 69. Windy, with a north wind 20 to 30 mph. Chance of precipitation is 30%.

    High: 69 °F

    Windy. Chance
    T-storms then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60. Breezy, with a north wind 20 to 25 mph decreasing to 10 to 15 mph after midnight.

    Low: 60 °F

    Mostly Clear
    and Breezy

  • Friday

    Friday: Sunny, with a high near 68. East wind 5 to 10 mph.

    High: 68 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. East wind around 5 mph.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 72. East wind around 5 mph.

    High: 72 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68. Southeast wind 5 to 10 mph.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 70. Southeast wind 10 to 15 mph.
Wednesday
Patchy fog between 8am and 9am. Otherwise, partly sunny, with a high near 75. Southeast wind 10 to 15 mph.
Wednesday Night
Showers and possibly a thunderstorm. Patchy fog between midnight and 3am. Low around 61. Breezy, with a south wind 10 to 20 mph becoming west after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 69. Windy, with a north wind 20 to 30 mph. Chance of precipitation is 30%.
Thursday Night
Mostly clear, with a low around 60. Breezy, with a north wind 20 to 25 mph decreasing to 10 to 15 mph after midnight.
Friday
Sunny, with a high near 68. East wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 64. East wind around 5 mph.
Saturday
Sunny, with a high near 72. East wind around 5 mph.
Saturday Night
Mostly clear, with a low around 68. Southeast wind 5 to 10 mph.
Sunday
Sunny, with a high near 75. South wind 5 to 10 mph.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 58. Southwest wind 10 to 15 mph becoming west after midnight.
Monday
Mostly cloudy, with a high near 65. Windy, with a north wind 20 to 30 mph.
Monday Night
Mostly cloudy, with a low around 50. Windy, with a north wind around 30 mph.
Tuesday
Partly sunny, with a high near 60. Breezy, with a northeast wind 15 to 25 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
5:51 pm CDT Mar 10, 2026
Forecast Valid:
9pm CDT Mar 10, 2026-6pm CDT Mar 17, 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