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

61°F

16°C

Humidity 74%
Wind Speed N 20 G 28 mph
Barometer 30.25 in
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 10 Jan 10:55 pm CST
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Mostly cloudy, with a low around 52. Breezy, with a north wind around 25 mph.

    Low: 52 °F

    Mostly Cloudy
    and Breezy

  • Sunday

    Sunday: Mostly sunny, with a high near 59. Breezy, with a north wind 20 to 25 mph.

    High: 59 °F

    Mostly Sunny
    and Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 49. Breezy, with a northeast wind around 20 mph.

    Low: 49 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: Partly sunny, with a high near 55. Northeast wind 10 to 15 mph.

    High: 55 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 50. Northeast wind around 10 mph.

    Low: 50 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 59. Northeast wind 5 to 10 mph becoming light north in the afternoon.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 53. Light north wind becoming west 5 to 10 mph after midnight.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly sunny, with a high near 64. West wind 10 to 15 mph.

    High: 64 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47. Breezy, with a west wind 15 to 20 mph becoming north after midnight.

    Low: 47 °F

    Mostly Clear
    and Breezy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 52. Breezy, with a north wind around 25 mph.
Sunday
Mostly sunny, with a high near 59. Breezy, with a north wind 20 to 25 mph.
Sunday Night
Partly cloudy, with a low around 49. Breezy, with a northeast wind around 20 mph.
Monday
Partly sunny, with a high near 55. Northeast wind 10 to 15 mph.
Monday Night
Partly cloudy, with a low around 50. Northeast wind around 10 mph.
Tuesday
Partly sunny, with a high near 59. Northeast wind 5 to 10 mph becoming light north in the afternoon.
Tuesday Night
A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 53. Light north wind becoming west 5 to 10 mph after midnight.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 64. West wind 10 to 15 mph.
Wednesday Night
Mostly clear, with a low around 47. Breezy, with a west wind 15 to 20 mph becoming north after midnight.
Thursday
Sunny, with a high near 54. Breezy, with a north wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 49. North wind 5 to 10 mph becoming southwest after midnight.
Friday
Sunny, with a high near 62. South wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 54. South wind around 10 mph becoming northeast after midnight.
Saturday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 63. Northeast 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:
9:52 pm CST Jan 10, 2026
Forecast Valid:
11pm CST Jan 10, 2026-6pm CST Jan 17, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation