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.

Partly Cloudy

42°F

6°C

Humidity 76%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 13 Jan 8:35 pm CST
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: A 30 percent chance of showers, mainly between 10pm and 5am. Increasing clouds, with a steady temperature around 58. Light west wind increasing to 5 to 10 mph in the evening.

    Low: 58 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65. Breezy, with a west wind 10 to 20 mph.

    High: 65 °F

    Partly Sunny
    then Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44. Breezy, with a north wind 20 to 25 mph.

    Low: 44 °F

    Partly Cloudy
    and Breezy

  • Thursday

    Thursday: Sunny, with a high near 52. Breezy, with a north wind 20 to 25 mph decreasing to 15 to 20 mph in the afternoon.

    High: 52 °F

    Sunny and
    Breezy then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 46. North wind 5 to 10 mph becoming south after midnight.

    Low: 46 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 63. Southwest wind 5 to 10 mph.

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52. Southwest wind 10 to 15 mph becoming northwest after midnight.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 59. North wind 10 to 15 mph.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 47. North wind 10 to 15 mph.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers, mainly between 10pm and 5am. Increasing clouds, with a steady temperature around 58. Light west wind increasing to 5 to 10 mph in the evening.
Wednesday
Mostly sunny, with a high near 65. Breezy, with a west wind 10 to 20 mph.
Wednesday Night
Partly cloudy, with a low around 44. Breezy, with a north wind 20 to 25 mph.
Thursday
Sunny, with a high near 52. Breezy, with a north wind 20 to 25 mph decreasing to 15 to 20 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 46. North wind 5 to 10 mph becoming south after midnight.
Friday
Sunny, with a high near 63. Southwest wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 52. Southwest wind 10 to 15 mph becoming northwest after midnight.
Saturday
Sunny, with a high near 59. North wind 10 to 15 mph.
Saturday Night
Mostly clear, with a low around 47. North wind 10 to 15 mph.
Sunday
Sunny, with a high near 56. North wind 10 to 15 mph.
Sunday Night
Mostly clear, with a low around 51. North wind around 10 mph becoming west after midnight.
M.L.King Day
Sunny, with a high near 62. Southeast wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 53. Southeast wind 5 to 10 mph becoming northeast after midnight.
Tuesday
Mostly sunny, with a high near 62. Northeast wind 10 to 15 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
5:17 pm CST Jan 13, 2026
Forecast Valid:
8pm CST Jan 13, 2026-6pm CST Jan 20, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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