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 90%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 9 Aug 7:15 am CDT
Extended Forecast for

Grand Isle LA

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly between 11am and 3pm. Partly sunny, with a high near 87. East wind 5 to 10 mph.

    High: 87 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 4am and 5am. Partly cloudy, with a steady temperature around 85. Southeast wind around 5 mph. Chance of precipitation is 20%.

    Low: 85 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly between 7am and 1pm. Sunny, with a high near 87. South wind around 5 mph.

    High: 87 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 82. South wind 5 to 10 mph.

    Low: 82 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 88. South wind around 5 mph.

    High: 88 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 83. South wind 5 to 10 mph.

    Low: 83 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 88. Southwest wind 5 to 10 mph.

    High: 88 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 83. South wind around 10 mph.

    Low: 83 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88. South wind 5 to 10 mph.

    High: 88 °F

    Sunny

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly between 11am and 3pm. Partly sunny, with a high near 87. East wind 5 to 10 mph.
Tonight
A slight chance of showers and thunderstorms between 4am and 5am. Partly cloudy, with a steady temperature around 85. Southeast wind around 5 mph. Chance of precipitation is 20%.
Monday
A 30 percent chance of showers and thunderstorms, mainly between 7am and 1pm. Sunny, with a high near 87. South wind around 5 mph.
Monday Night
Mostly clear, with a low around 82. South wind 5 to 10 mph.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 88. South wind around 5 mph.
Tuesday Night
Partly cloudy, with a low around 83. South wind 5 to 10 mph.
Wednesday
A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 88. Southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 83. South wind around 10 mph.
Thursday
Sunny, with a high near 88. South wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 83. South wind around 10 mph.
Friday
Sunny, with a high near 88. South wind around 5 mph.
Friday Night
Mostly clear, with a low around 83. South wind 5 to 10 mph.
Saturday
Sunny, with a high near 88. Southwest wind around 5 mph becoming south in the afternoon.
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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 am CDT Aug 9, 2026
Forecast Valid:
7am CDT Aug 9, 2026-6pm CDT Aug 15, 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