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

83°F

28°C

Humidity 73%
Wind Speed SE 13 G 17 mph
Barometer 30.06 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 17 May 12:35 pm CDT
Extended Forecast for

Grand Isle LA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 82. Southeast wind around 15 mph.

    High: 82 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a steady temperature around 80. Southeast wind around 15 mph.

    Low: 80 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 83. Southeast wind around 15 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 77. Southeast wind around 15 mph.

    Low: 77 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Southeast wind 10 to 15 mph.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 77. Southeast wind 5 to 10 mph.

    Low: 77 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 82. Southeast wind 5 to 10 mph.

    High: 82 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Southeast wind around 5 mph.

    Low: 77 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 83. Southeast wind 5 to 10 mph.

    High: 83 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 82. Southeast wind around 15 mph.
Tonight
Mostly cloudy, with a steady temperature around 80. Southeast wind around 15 mph.
Monday
Mostly sunny, with a high near 83. Southeast wind around 15 mph.
Monday Night
Partly cloudy, with a low around 77. Southeast wind around 15 mph.
Tuesday
Mostly sunny, with a high near 82. Southeast wind 10 to 15 mph.
Tuesday Night
Mostly cloudy, with a low around 77. Southeast wind 5 to 10 mph.
Wednesday
Partly sunny, with a high near 82. Southeast wind 5 to 10 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Southeast wind around 5 mph.
Thursday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 83. Southeast wind 5 to 10 mph.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 78. Southeast wind around 5 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. Southeast wind 5 to 10 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Southeast wind 5 to 10 mph.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South wind around 10 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:
5:21 am CDT May 17, 2026
Forecast Valid:
12pm CDT May 17, 2026-6pm CDT May 23, 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