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.

Mostly Cloudy

70°F

21°C

Humidity 84%
Wind Speed E 7 mph
Barometer 30.23 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 30 Mar 12:35 am CDT
Extended Forecast for

Grand Isle LA

  • Overnight

    Overnight: A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 68. East wind around 15 mph. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Monday

    Monday: Showers and thunderstorms likely, mainly before 1pm. Partly sunny, with a high near 76. Southeast wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 69. Southeast wind around 10 mph.

    Low: 69 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 76. Southeast wind around 10 mph. Chance of precipitation is 80%.

    High: 76 °F

    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 70. Southeast wind around 10 mph. Chance of precipitation is 40%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 76. Southeast wind around 10 mph. Chance of precipitation is 60%.

    High: 76 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A slight chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 71. Southeast wind 10 to 15 mph. Chance of precipitation is 20%.

    Low: 71 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 77. Southeast wind around 15 mph. Chance of precipitation is 60%.

    High: 77 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southeast wind 10 to 15 mph.

    Low: 71 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 68. East wind around 15 mph. Chance of precipitation is 30%.
Monday
Showers and thunderstorms likely, mainly before 1pm. Partly sunny, with a high near 76. Southeast wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 69. Southeast wind around 10 mph.
Tuesday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 76. Southeast wind around 10 mph. Chance of precipitation is 80%.
Tuesday Night
A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 70. Southeast wind around 10 mph. Chance of precipitation is 40%.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 76. Southeast wind around 10 mph. Chance of precipitation is 60%.
Wednesday Night
A slight chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 71. Southeast wind 10 to 15 mph. Chance of precipitation is 20%.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 77. Southeast wind around 15 mph. Chance of precipitation is 60%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southeast wind 10 to 15 mph.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 76. Southeast wind around 15 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southeast wind 10 to 15 mph.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 76. Southeast wind around 15 mph.
Saturday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southeast wind 10 to 15 mph.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. Southeast wind 10 to 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:
12:17 am CDT Mar 30, 2026
Forecast Valid:
12am CDT Mar 30, 2026-6pm CDT Apr 5, 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