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.

Partly Cloudy

75°F

24°C

Humidity 72%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 15 Apr 6:55 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Partly cloudy, with a low around 71. Southeast wind 5 to 10 mph.

    Low: 71 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 77. Southeast wind 5 to 10 mph.

    High: 77 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 71. South wind around 5 mph.

    Low: 71 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 76. Southeast wind 5 to 10 mph.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 71. South wind around 10 mph.

    Low: 71 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 77. South wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 66. South wind 5 to 10 mph becoming northwest after midnight.

    Low: 66 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 73. Breezy, with a northeast wind around 20 mph.

    High: 73 °F

    Slight Chance
    T-storms and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 65. Breezy, with a northeast wind 15 to 25 mph.

    Low: 65 °F

    Mostly Cloudy
    and Breezy

Detailed Forecast

Tonight
Partly cloudy, with a low around 71. Southeast wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 77. Southeast wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 71. South wind around 5 mph.
Friday
Sunny, with a high near 76. Southeast wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 71. South wind around 10 mph.
Saturday
Partly sunny, with a high near 77. South wind 5 to 10 mph.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 66. South wind 5 to 10 mph becoming northwest after midnight.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 73. Breezy, with a northeast wind around 20 mph.
Sunday Night
Mostly cloudy, with a low around 65. Breezy, with a northeast wind 15 to 25 mph.
Monday
Partly sunny, with a high near 72. Breezy, with a northeast wind 15 to 25 mph.
Monday Night
Mostly cloudy, with a low around 68. East wind around 15 mph.
Tuesday
A slight chance of showers. Mostly cloudy, with a high near 74. Breezy, with an east wind 15 to 20 mph.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 68. East wind 10 to 15 mph.
Wednesday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 74. East wind 10 to 15 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
6:19 pm CDT Apr 15, 2026
Forecast Valid:
7pm CDT Apr 15, 2026-6pm CDT Apr 22, 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