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

75°F

24°C

Humidity 91%
Wind Speed Calm
Barometer 30.00 in
Dewpoint 73°F (23°C)
Visibility 7.00 mi
Last update 2 Sep 3:55 am CDT
Extended Forecast for

Grand Isle LA

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly between 8am and 4pm. Mostly sunny, with a high near 88. Calm wind becoming east around 5 mph in the morning.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a steady temperature around 85. Southeast wind around 5 mph becoming calm.

    Low: 85 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Sunny, with a high near 88. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 88 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 81. Southeast wind around 5 mph.

    Low: 81 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. North wind around 5 mph becoming south in the afternoon. Chance of precipitation is 70%.

    High: 88 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly clear, with a low around 81. South wind around 5 mph. Chance of precipitation is 30%.

    Low: 81 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. West wind around 5 mph becoming south in the afternoon.

    High: 88 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 82. Southwest wind around 5 mph.

    Low: 82 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms, mainly after 1pm. Sunny, with a high near 88. Northwest wind around 5 mph becoming south in the afternoon.

    High: 88 °F

    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly between 8am and 4pm. Mostly sunny, with a high near 88. Calm wind becoming east around 5 mph in the morning.
Tonight
Mostly clear, with a steady temperature around 85. Southeast wind around 5 mph becoming calm.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Sunny, with a high near 88. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 81. Southeast wind around 5 mph.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. North wind around 5 mph becoming south in the afternoon. Chance of precipitation is 70%.
Friday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly clear, with a low around 81. South wind around 5 mph. Chance of precipitation is 30%.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. West wind around 5 mph becoming south in the afternoon.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 82. Southwest wind around 5 mph.
Sunday
A chance of showers and thunderstorms, mainly after 1pm. Sunny, with a high near 88. Northwest wind around 5 mph becoming south in the afternoon.
Sunday Night
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 82. Southwest wind around 5 mph.
Labor Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Northwest wind around 5 mph becoming southeast in the afternoon.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. South wind around 5 mph.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southeast wind around 5 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
2:02 am CDT Sep 2, 2026
Forecast Valid:
4am CDT Sep 2, 2026-6pm CDT Sep 8, 2026
 
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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