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.

Overcast

59°F

15°C

Humidity 92%
Wind Speed N 12 G 16 mph
Barometer 30.01 in
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 8 Dec 2:35 am CST
Extended Forecast for

Grand Isle LA

  • Overnight

    Overnight: A 50 percent chance of showers, mainly before 3am. Cloudy, with a low around 55. Breezy, with a north wind 10 to 20 mph. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 55 °F

    Chance
    Showers and
    Breezy

  • Monday

    Monday: Partly sunny, with a steady temperature around 57. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 57 °F

    Partly Sunny
    and Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 51. Northeast wind 10 to 15 mph.

    Low: 51 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 59. Northeast wind 5 to 10 mph.

    High: 59 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 55. Calm wind becoming southwest around 5 mph after midnight.

    Low: 55 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 66. West wind around 5 mph.

    High: 66 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59. West wind around 5 mph.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 68. Northwest wind around 5 mph becoming southeast in the afternoon.

    High: 68 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62. South wind around 5 mph.

    Low: 62 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 50 percent chance of showers, mainly before 3am. Cloudy, with a low around 55. Breezy, with a north wind 10 to 20 mph. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Partly sunny, with a steady temperature around 57. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
Partly cloudy, with a low around 51. Northeast wind 10 to 15 mph.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 59. Northeast wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 55. Calm wind becoming southwest around 5 mph after midnight.
Wednesday
Sunny, with a high near 66. West wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 59. West wind around 5 mph.
Thursday
Sunny, with a high near 68. Northwest wind around 5 mph becoming southeast in the afternoon.
Thursday Night
Partly cloudy, with a low around 62. South wind around 5 mph.
Friday
Mostly sunny, with a high near 68. South wind 5 to 10 mph becoming southeast in the afternoon.
Friday Night
Partly cloudy, with a low around 57. East wind 10 to 15 mph becoming northeast after midnight.
Saturday
Mostly sunny, with a high near 60. Northeast wind around 15 mph.
Saturday Night
Partly cloudy, with a low around 55. Northeast wind around 15 mph.
Sunday
Sunny, with a high near 61. 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:
11:31 pm CST Dec 7, 2025
Forecast Valid:
2am CST Dec 8, 2025-6pm CST Dec 14, 2025
 
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