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

78°F

26°C

Humidity 87%
Wind Speed Calm
Barometer 29.96 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 3 Sep 9:35 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a steady temperature around 83. Southeast wind around 5 mph becoming calm in the evening.

    Low: 83 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers and thunderstorms likely, mainly between 9am and 2pm. Cloudy, with a steady temperature around 83. North wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 83 °F

    T-storms
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a steady temperature around 83. Calm wind becoming west around 5 mph after midnight.

    Low: 83 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely before 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 86. Northwest wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 70%.

    High: 86 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 81. Southwest wind around 5 mph. Chance of precipitation is 30%.

    Low: 81 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. Northwest wind around 5 mph becoming southwest in the afternoon.

    High: 87 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 81. West wind around 5 mph.

    Low: 81 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Labor Day

    Labor Day: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Northwest wind around 5 mph becoming east in the afternoon.

    High: 88 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southwest wind around 5 mph becoming southeast after midnight.

    Low: 82 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a steady temperature around 83. Southeast wind around 5 mph becoming calm in the evening.
Friday
Showers and thunderstorms likely, mainly between 9am and 2pm. Cloudy, with a steady temperature around 83. North wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a steady temperature around 83. Calm wind becoming west around 5 mph after midnight.
Saturday
Showers and thunderstorms likely before 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 86. Northwest wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 70%.
Saturday Night
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 81. Southwest wind around 5 mph. Chance of precipitation is 30%.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. Northwest wind around 5 mph becoming southwest in the afternoon.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 81. West wind around 5 mph.
Labor Day
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Northwest wind around 5 mph becoming east in the afternoon.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southwest wind around 5 mph becoming southeast after midnight.
Tuesday
Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 87. East wind 5 to 10 mph.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southeast wind 5 to 10 mph.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Southeast wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 82. Southeast wind around 5 mph.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Southeast wind around 5 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:
6:29 pm CDT Sep 3, 2026
Forecast Valid:
9pm CDT Sep 3, 2026-6pm CDT Sep 10, 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