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.

Mostly Cloudy

86°F

30°C

Humidity 73%
Wind Speed NE 9 G 16 mph
Barometer 30.15 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 16 Sep 3:55 pm CDT
Extended Forecast for

Grand Isle LA

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 88. Breezy, with an east wind around 20 mph.

    High: 88 °F

    Chance
    T-storms and
    Breezy

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 83. Breezy, with an east wind 15 to 20 mph.

    Low: 83 °F

    Breezy.
    Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88. Breezy, with an east wind 15 to 20 mph.

    High: 88 °F

    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 82. Breezy, with an east wind 15 to 20 mph.

    Low: 82 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Friday

    Friday: Sunny, with a high near 88. East wind around 15 mph.

    High: 88 °F

    Sunny

  • Friday Night

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

    Low: 82 °F

    Mostly Clear

  • Sunday

    Sunday: A slight chance of showers and thunderstorms. Sunny, with a high near 88. Northeast wind 5 to 10 mph.

    High: 88 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 88. Breezy, with an east wind around 20 mph.
Tonight
A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 83. Breezy, with an east wind 15 to 20 mph.
Thursday
Sunny, with a high near 88. Breezy, with an east wind 15 to 20 mph.
Thursday Night
Mostly clear, with a low around 82. Breezy, with an east wind 15 to 20 mph.
Friday
Sunny, with a high near 88. East wind around 15 mph.
Friday Night
Mostly clear, with a low around 81. East wind 5 to 10 mph.
Saturday
Sunny, with a high near 88. East wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 82. Southeast wind around 5 mph.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 88. Northeast wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 82. East wind around 5 mph.
Monday
A chance of showers and thunderstorms. Sunny, with a high near 87. Northeast wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 82. East wind around 5 mph.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Northeast wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 81. East wind around 5 mph.
Wednesday
A chance of showers and thunderstorms. Sunny, with a high near 87. Northeast wind around 10 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:
2:02 pm CDT Sep 16, 2026
Forecast Valid:
4pm CDT Sep 16, 2026-6pm CDT Sep 23, 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