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 68%
Wind Speed NE 7 mph
Barometer 30.18 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 23 Nov 9:15 am CST
Extended Forecast for

Grand Isle LA

  • Today

    Today: Sunny, with a high near 75. Northeast wind 5 to 10 mph.

    High: 75 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 70. East wind around 5 mph.

    Low: 70 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 76. South wind 5 to 10 mph.

    High: 76 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 72. South wind 10 to 15 mph.

    Low: 72 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 9am. Partly sunny, with a high near 78. South wind 5 to 15 mph. Chance of precipitation is 30%.

    High: 78 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South wind 5 to 10 mph becoming north after midnight.

    Low: 69 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms. Partly sunny, with a high near 74. North wind 10 to 15 mph. Chance of precipitation is 20%.

    High: 74 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. Breezy, with a north wind 15 to 25 mph.

    Low: 57 °F

    Partly Cloudy
    and Breezy

  • Thanksgiving Day

    Thanksgiving Day: Sunny, with a high near 65. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 65 °F

    Sunny and
    Breezy then
    Sunny

Detailed Forecast

Today
Sunny, with a high near 75. Northeast wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 70. East wind around 5 mph.
Monday
Mostly sunny, with a high near 76. South wind 5 to 10 mph.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 72. South wind 10 to 15 mph.
Tuesday
A chance of showers, with thunderstorms also possible after 9am. Partly sunny, with a high near 78. South wind 5 to 15 mph. Chance of precipitation is 30%.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South wind 5 to 10 mph becoming north after midnight.
Wednesday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 74. North wind 10 to 15 mph. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 57. Breezy, with a north wind 15 to 25 mph.
Thanksgiving Day
Sunny, with a high near 65. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 30 mph.
Thursday Night
Mostly clear, with a low around 59. Breezy, with a northeast wind 15 to 20 mph.
Friday
Sunny, with a high near 67. East wind around 15 mph.
Friday Night
Partly cloudy, with a low around 63. Southeast wind around 15 mph.
Saturday
Partly sunny, with a high near 72. Breezy, with a southeast wind 15 to 20 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:
9:17 am CST Nov 23, 2025
Forecast Valid:
9am CST Nov 23, 2025-6pm CST Nov 29, 2025
 
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