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

71°F

22°C

Humidity 91%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 19 Sep 3:35 am CDT
Extended Forecast for

4 Miles SW Grand Isle LA

  • Overnight

    Overnight: Mostly clear, with a low around 81. East wind around 5 mph.

    Low: 81 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 88. East wind 5 to 10 mph.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 82. East wind around 5 mph.

    Low: 82 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 88. Calm wind becoming northeast around 5 mph in the morning.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 81. Southeast wind around 5 mph becoming calm.

    Low: 81 °F

    Mostly Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Sunny, with a high near 88. Northeast wind 5 to 10 mph.

    High: 88 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 81. East wind around 5 mph becoming calm.

    Low: 81 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. North wind 5 to 10 mph becoming east in the afternoon.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 81. East wind around 5 mph.

    Low: 81 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 81. East wind around 5 mph.
Saturday
Sunny, with a high near 88. East wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 82. East wind around 5 mph.
Sunday
Sunny, with a high near 88. Calm wind becoming northeast around 5 mph in the morning.
Sunday Night
Mostly clear, with a low around 81. Southeast wind around 5 mph becoming calm.
Monday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Sunny, with a high near 88. Northeast wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 81. East wind around 5 mph becoming calm.
Tuesday
Sunny, with a high near 88. North wind 5 to 10 mph becoming east in the afternoon.
Tuesday Night
Mostly clear, with a low around 81. East wind around 5 mph.
Wednesday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. Northeast wind 10 to 15 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 81. East wind 5 to 10 mph.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 87. Northeast wind around 15 mph.
Thursday Night
Mostly clear, with a low around 80. East wind 10 to 15 mph.
Friday
Mostly sunny, with a high near 86. East wind around 15 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Grand Isle LA
 29.19°N 90.04°W
Last Update:
2:01 am CDT Sep 19, 2026
Forecast Valid:
3am CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
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Additional Resources

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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