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.

Fair

77°F

25°C

Humidity 83%
Wind Speed NE 9 mph
Barometer 29.90 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 6 Oct 8:56 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Mostly cloudy, with a low around 78. Breezy, with a northeast wind around 20 mph.

    Low: 78 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Partly sunny, with a high near 83. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 30%.

    High: 83 °F

    Breezy.
    Partly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers before 4am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, then gradually becoming mostly clear, with a low around 78. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 20%.

    Low: 78 °F

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. Breezy, with a northeast wind around 25 mph. Chance of precipitation is 70%.

    High: 83 °F

    Breezy.
    Chance
    T-storms then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely after 10pm. Mostly cloudy, with a low around 78. Breezy, with an east wind around 25 mph. Chance of precipitation is 60%.

    Low: 78 °F

    Showers
    Likely and
    Breezy

  • Friday

    Friday: Tropical storm conditions possible. Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 80%.

    High: 82 °F

    Tropical
    Storm
    Conditions
    Possible

  • Friday Night

    Friday Night: Tropical storm conditions possible. Showers and possibly a thunderstorm. Low around 76. Chance of precipitation is 80%.

    Low: 76 °F

    Tropical
    Storm
    Conditions
    Possible

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Windy, with a southeast wind 30 to 35 mph, with gusts as high as 50 mph. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely and
    Windy

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Windy, with a southeast wind 25 to 30 mph decreasing to 15 to 20 mph after midnight.

    Low: 77 °F

    Chance
    Showers and
    Windy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 78. Breezy, with a northeast wind around 20 mph.
Wednesday
A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Partly sunny, with a high near 83. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 30%.
Wednesday Night
A slight chance of showers before 4am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, then gradually becoming mostly clear, with a low around 78. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 20%.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. Breezy, with a northeast wind around 25 mph. Chance of precipitation is 70%.
Thursday Night
A chance of showers and thunderstorms, then showers likely after 10pm. Mostly cloudy, with a low around 78. Breezy, with an east wind around 25 mph. Chance of precipitation is 60%.
Friday
Tropical storm conditions possible. Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 80%.
Friday Night
Tropical storm conditions possible. Showers and possibly a thunderstorm. Low around 76. Chance of precipitation is 80%.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Windy, with a southeast wind 30 to 35 mph, with gusts as high as 50 mph. Chance of precipitation is 70%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Windy, with a southeast wind 25 to 30 mph decreasing to 15 to 20 mph after midnight.
Sunday
A chance of showers. Mostly sunny, with a high near 83. Southwest wind 10 to 15 mph.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 78. Southwest wind around 5 mph becoming northwest after midnight.
Columbus Day
A chance of showers. Mostly sunny, with a high near 83. Northwest wind 5 to 10 mph becoming east in the afternoon.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 77. Southeast wind around 5 mph becoming northeast after midnight.
Tuesday
A chance of showers. Mostly sunny, with a high near 83. East wind 5 to 10 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
4:49 pm CDT Oct 6, 2026
Forecast Valid:
9pm CDT Oct 6, 2026-6pm CDT Oct 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