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

67°F

19°C

Humidity 51%
Wind Speed S 5 mph
Barometer 30.07 in
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 13 Mar 5:35 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Mostly clear, with a low around 64. Calm wind becoming southeast around 5 mph after midnight.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 72. Southeast wind around 5 mph.

    High: 72 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 68. Southeast wind around 10 mph.

    Low: 68 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 76. South wind 10 to 15 mph.

    High: 76 °F

    Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 51. Windy, with a south wind 15 to 20 mph becoming northwest 25 to 30 mph after midnight. Chance of precipitation is 70%.

    Low: 51 °F

    Showers
    Likely and
    Windy

  • Monday

    Monday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 59. Windy, with a north wind 25 to 35 mph.

    High: 59 °F

    Slight Chance
    Showers and
    Windy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 45. Windy, with a north wind 20 to 30 mph.

    Low: 45 °F

    Mostly Cloudy
    and Windy

  • Tuesday

    Tuesday: Partly sunny, with a high near 57. Breezy, with a northeast wind 15 to 20 mph.

    High: 57 °F

    Partly Sunny
    and Breezy
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 52. Northeast wind 5 to 10 mph.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 64. Calm wind becoming southeast around 5 mph after midnight.
Saturday
Mostly sunny, with a high near 72. Southeast wind around 5 mph.
Saturday Night
Partly cloudy, with a low around 68. Southeast wind around 10 mph.
Sunday
Sunny, with a high near 76. South wind 10 to 15 mph.
Sunday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 51. Windy, with a south wind 15 to 20 mph becoming northwest 25 to 30 mph after midnight. Chance of precipitation is 70%.
Monday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 59. Windy, with a north wind 25 to 35 mph.
Monday Night
Mostly cloudy, with a low around 45. Windy, with a north wind 20 to 30 mph.
Tuesday
Partly sunny, with a high near 57. Breezy, with a northeast wind 15 to 20 mph.
Tuesday Night
Mostly clear, with a low around 52. Northeast wind 5 to 10 mph.
Wednesday
Mostly sunny, with a high near 63. East wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 59. Southeast wind around 5 mph.
Thursday
Sunny, with a high near 68. East wind around 5 mph.
Thursday Night
Partly cloudy, with a low around 62. South wind around 5 mph becoming west after midnight.
Friday
Sunny, with a high near 72. West wind around 5 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
12:31 pm CDT Mar 13, 2026
Forecast Valid:
5pm CDT Mar 13, 2026-6pm CDT Mar 20, 2026
 
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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