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

90°F

32°C

Humidity 55%
Wind Speed N 13 mph
Barometer 29.98 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 24 Sep 4:55 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: A 20 percent chance of showers. Partly cloudy, with a low around 80. East wind 5 to 10 mph.

    Low: 80 °F

    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers before 2pm. Mostly sunny, with a high near 84. East wind 10 to 15 mph.

    High: 84 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 80. East wind around 10 mph.

    Low: 80 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 85. East wind 5 to 10 mph.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 80. South wind around 5 mph.

    Low: 80 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 85. North wind around 5 mph becoming southeast in the afternoon.

    High: 85 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 81. South wind around 5 mph.

    Low: 81 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 85. West wind around 5 mph becoming east in the morning.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 81. Southeast wind 5 to 10 mph.

    Low: 81 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers. Partly cloudy, with a low around 80. East wind 5 to 10 mph.
Friday
A 20 percent chance of showers before 2pm. Mostly sunny, with a high near 84. East wind 10 to 15 mph.
Friday Night
Mostly clear, with a low around 80. East wind around 10 mph.
Saturday
Mostly sunny, with a high near 85. East wind 5 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 80. South wind around 5 mph.
Sunday
Mostly sunny, with a high near 85. North wind around 5 mph becoming southeast in the afternoon.
Sunday Night
Mostly clear, with a low around 81. South wind around 5 mph.
Monday
Sunny, with a high near 85. West wind around 5 mph becoming east in the morning.
Monday Night
Mostly clear, with a low around 81. Southeast wind 5 to 10 mph.
Tuesday
Mostly sunny, with a high near 85. Southeast wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 81. Southeast wind around 15 mph.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. South wind around 15 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 80. South wind around 15 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 85. South wind around 15 mph.
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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:
1:57 pm CDT Sep 24, 2026
Forecast Valid:
5pm CDT Sep 24, 2026-6pm CDT Oct 1, 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