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 74%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 16 Feb 10:35 am CST
Extended Forecast for

Grand Isle LA

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 63. Northeast wind 5 to 10 mph.

    High: 63 °F

    Partly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 58. East wind around 5 mph becoming southeast after midnight.

    Low: 58 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 68. Southeast wind 5 to 10 mph.

    High: 68 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 64. Southeast wind 5 to 10 mph.

    Low: 64 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 70. South wind 5 to 10 mph.

    High: 70 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 65. South wind 5 to 15 mph.

    Low: 65 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 71. South wind around 15 mph.

    High: 71 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 66. South wind 10 to 15 mph.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers. Mostly cloudy, with a high near 71. South wind around 10 mph.

    High: 71 °F

    Chance
    Showers

Detailed Forecast

Washington's Birthday
Partly sunny, with a high near 63. Northeast wind 5 to 10 mph.
Tonight
Increasing clouds, with a low around 58. East wind around 5 mph becoming southeast after midnight.
Tuesday
Cloudy, then gradually becoming mostly sunny, with a high near 68. Southeast wind 5 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 64. Southeast wind 5 to 10 mph.
Wednesday
Mostly sunny, with a high near 70. South wind 5 to 10 mph.
Wednesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 65. South wind 5 to 15 mph.
Thursday
Mostly sunny, with a high near 71. South wind around 15 mph.
Thursday Night
A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 66. South wind 10 to 15 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 71. South wind around 10 mph.
Friday Night
A chance of showers, mainly after midnight. Mostly cloudy, with a low around 64. South wind around 10 mph.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 71. South wind around 15 mph becoming west in the afternoon.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 58. Breezy, with a north wind 15 to 20 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 65. Breezy, with a north wind around 20 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:
9:57 am CST Feb 16, 2026
Forecast Valid:
10am CST Feb 16, 2026-6pm CST Feb 22, 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