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

49°F

9°C

Humidity 89%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 2 Jan 12:15 am CST
Extended Forecast for

Grand Isle LA

  • Overnight

    Overnight: Mostly cloudy, with a low around 62. Southwest wind around 10 mph.

    Low: 62 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 70. Breezy, with a southwest wind 10 to 20 mph.

    High: 70 °F

    Mostly Sunny
    then Partly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 67. Breezy, with a southwest wind around 20 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    Showers and
    Breezy

  • Saturday

    Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 72. Breezy, with a southwest wind 15 to 20 mph. Chance of precipitation is 50%.

    High: 72 °F

    Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56. West wind 10 to 15 mph becoming north after midnight.

    Low: 56 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 63. Northeast wind 5 to 15 mph.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 58. Northeast wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 67. East wind around 5 mph becoming southeast in the afternoon.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. South wind around 5 mph.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 62. Southwest wind around 10 mph.
Friday
Mostly sunny, with a high near 70. Breezy, with a southwest wind 10 to 20 mph.
Friday Night
A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 67. Breezy, with a southwest wind around 20 mph. Chance of precipitation is 40%.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 72. Breezy, with a southwest wind 15 to 20 mph. Chance of precipitation is 50%.
Saturday Night
Mostly clear, with a low around 56. West wind 10 to 15 mph becoming north after midnight.
Sunday
Sunny, with a high near 63. Northeast wind 5 to 15 mph.
Sunday Night
Mostly clear, with a low around 58. Northeast wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 67. East wind around 5 mph becoming southeast in the afternoon.
Monday Night
Partly cloudy, with a low around 63. South wind around 5 mph.
Tuesday
Mostly sunny, with a high near 70. South wind around 5 mph.
Tuesday Night
Partly cloudy, with a low around 65. South wind around 5 mph.
Wednesday
Mostly sunny, with a high near 70. South wind 5 to 10 mph.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 65. South wind 5 to 10 mph.
Thursday
A chance of showers. Mostly sunny, with a high near 71. South wind around 10 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:
11:31 pm CST Jan 1, 2026
Forecast Valid:
12am CST Jan 2, 2026-6pm CST Jan 8, 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