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

70°F

21°C

Humidity 67%
Wind Speed E 8 mph
Barometer 30.12 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 17 Feb 11:35 am CST
Extended Forecast for

Grand Isle LA

  • Today

    Today: Mostly sunny, with a high near 68. East wind 5 to 10 mph.

    High: 68 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. South wind 5 to 10 mph.

    Low: 63 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69. South wind around 10 mph.

    High: 69 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 65. South wind 10 to 15 mph.

    Low: 65 °F

    Chance
    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 71. South wind around 15 mph.

    High: 71 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 66. South wind 10 to 15 mph.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers. Mostly cloudy, with a high near 72. South wind 10 to 15 mph.

    High: 72 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 66. South wind around 10 mph.

    Low: 66 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 72. South wind 10 to 15 mph.

    High: 72 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 68. East wind 5 to 10 mph.
Tonight
Mostly cloudy, with a low around 63. South wind 5 to 10 mph.
Wednesday
Partly sunny, with a high near 69. South wind around 10 mph.
Wednesday Night
A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 65. South wind 10 to 15 mph.
Thursday
Mostly sunny, with a high near 71. South wind around 15 mph.
Thursday Night
A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 66. South wind 10 to 15 mph.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 72. South wind 10 to 15 mph.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 66. South wind around 10 mph.
Saturday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 72. South wind 10 to 15 mph.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 52. Breezy, with a southwest wind 10 to 15 mph becoming north 20 to 25 mph after midnight.
Sunday
A slight chance of showers. Sunny, with a high near 61. Windy, with a north wind 20 to 30 mph.
Sunday Night
Mostly clear, with a low around 47. Breezy, with a north wind around 25 mph.
Monday
Sunny, with a high near 55. Breezy, with a north wind 20 to 25 mph decreasing to 15 to 20 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
11:32 am CST Feb 17, 2026
Forecast Valid:
11am CST Feb 17, 2026-6pm CST Feb 23, 2026
 
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Additional Resources

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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