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

73°F

23°C

Humidity 36%
Wind Speed NE 10 mph
Barometer 30.28 in
Dewpoint 44°F (7°C)
Visibility NA
Last update 28 Mar 3:15 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Mostly clear, with a low around 65. Northeast wind 10 to 15 mph.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers after 11am. Mostly sunny, with a high near 73. Breezy, with an east wind 15 to 20 mph.

    High: 73 °F

    Slight Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 68. Breezy, with an east wind 15 to 20 mph.

    Low: 68 °F

    Slight Chance
    Showers and
    Breezy

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Southeast wind 10 to 15 mph. Chance of precipitation is 30%.

    High: 75 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers before 10pm. Partly cloudy, with a low around 69. Southeast wind around 10 mph.

    Low: 69 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 75. Southeast wind around 10 mph.

    High: 75 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. Southeast wind around 10 mph.

    Low: 70 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 76. Southeast wind around 10 mph.

    High: 76 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers after 1am. Partly cloudy, with a low around 71. Southeast wind around 10 mph.

    Low: 71 °F

    Mostly Clear
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 65. Northeast wind 10 to 15 mph.
Sunday
A 20 percent chance of showers after 11am. Mostly sunny, with a high near 73. Breezy, with an east wind 15 to 20 mph.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 68. Breezy, with an east wind 15 to 20 mph.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Southeast wind 10 to 15 mph. Chance of precipitation is 30%.
Monday Night
A 20 percent chance of showers before 10pm. Partly cloudy, with a low around 69. Southeast wind around 10 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 75. Southeast wind around 10 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. Southeast wind around 10 mph.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 76. Southeast wind around 10 mph.
Wednesday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 71. Southeast wind around 10 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. Southeast wind 10 to 15 mph.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 71. Southeast wind 10 to 15 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 77. Southeast wind 10 to 15 mph.
Friday Night
Mostly cloudy, with a low around 71. Southeast wind around 15 mph.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. Southeast wind around 15 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:
1:25 pm CDT Mar 28, 2026
Forecast Valid:
3pm CDT Mar 28, 2026-6pm CDT Apr 4, 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