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

73°F

23°C

Humidity 85%
Wind Speed SE 8 mph
Barometer 30.07 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 3 Apr 3:35 am CDT
Extended Forecast for

Grand Isle LA

  • Today

    Today: Mostly sunny, with a high near 75. Southeast wind 10 to 15 mph.

    High: 75 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 71. Southeast wind 10 to 15 mph.

    Low: 71 °F

    Partly Cloudy

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 76. Southeast wind 10 to 15 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Southeast wind 5 to 10 mph. Chance of precipitation is 70%.

    Low: 69 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 74. South wind 5 to 10 mph becoming north in the morning. Chance of precipitation is 80%.

    High: 74 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Cloudy, with a low around 61. Breezy, with a northeast wind 15 to 25 mph. Chance of precipitation is 40%.

    Low: 61 °F

    Chance
    Showers and
    Breezy

  • Monday

    Monday: A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 67. Windy, with a northeast wind 20 to 30 mph.

    High: 67 °F

    Chance
    Showers and
    Windy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 62. Breezy, with a northeast wind 15 to 20 mph.

    Low: 62 °F

    Mostly Cloudy
    and Breezy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 71. Breezy, with a northeast wind 20 to 25 mph.

    High: 71 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Today
Mostly sunny, with a high near 75. Southeast wind 10 to 15 mph.
Tonight
Partly cloudy, with a low around 71. Southeast wind 10 to 15 mph.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 76. Southeast wind 10 to 15 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Southeast wind 5 to 10 mph. Chance of precipitation is 70%.
Sunday
Showers and possibly a thunderstorm. High near 74. South wind 5 to 10 mph becoming north in the morning. Chance of precipitation is 80%.
Sunday Night
A chance of showers and thunderstorms. Cloudy, with a low around 61. Breezy, with a northeast wind 15 to 25 mph. Chance of precipitation is 40%.
Monday
A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 67. Windy, with a northeast wind 20 to 30 mph.
Monday Night
Mostly cloudy, with a low around 62. Breezy, with a northeast wind 15 to 20 mph.
Tuesday
Mostly sunny, with a high near 71. Breezy, with a northeast wind 20 to 25 mph.
Tuesday Night
Mostly cloudy, with a low around 65. Breezy, with a northeast wind 15 to 20 mph.
Wednesday
A chance of showers. Mostly sunny, with a high near 71. Breezy, with an east wind around 20 mph.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 66. Breezy, with an east wind 20 to 25 mph.
Thursday
A chance of showers. Mostly sunny, with a high near 72. Breezy, with an east wind 20 to 25 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:
5:27 am CDT Apr 3, 2026
Forecast Valid:
6am CDT Apr 3, 2026-6pm CDT Apr 9, 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