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

71°F

22°C

Humidity 82%
Wind Speed SE 3 mph
Barometer 30.08 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 1 Apr 8:55 pm CDT
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 70. Southeast wind around 15 mph.

    Low: 70 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 76. Southeast wind around 15 mph.

    High: 76 °F

    Chance
    T-storms and
    Patchy Fog

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 70. Southeast wind around 15 mph. Chance of precipitation is 20%.

    Low: 70 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday

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

    High: 75 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 71. Southeast wind around 10 mph.

    Low: 71 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 76. Southeast wind 10 to 15 mph. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Southeast wind 5 to 10 mph.

    Low: 69 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. Southwest wind 5 to 10 mph becoming north in the afternoon. Chance of precipitation is 70%.

    High: 75 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers, with thunderstorms also possible after 1am. Cloudy, with a low around 60. Breezy, with a north wind 15 to 20 mph.

    Low: 60 °F

    Chance
    Showers and
    Breezy

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 70. Southeast wind around 15 mph.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 76. Southeast wind around 15 mph.
Thursday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 70. Southeast wind around 15 mph. Chance of precipitation is 20%.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 75. Southeast wind 10 to 15 mph. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 71. Southeast wind around 10 mph.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 76. Southeast wind 10 to 15 mph. Chance of precipitation is 40%.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Southeast wind 5 to 10 mph.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. Southwest wind 5 to 10 mph becoming north in the afternoon. Chance of precipitation is 70%.
Sunday Night
A chance of showers, with thunderstorms also possible after 1am. Cloudy, with a low around 60. Breezy, with a north wind 15 to 20 mph.
Monday
A slight chance of showers. Cloudy, with a high near 68. Breezy, with a northeast wind 15 to 20 mph.
Monday Night
Mostly cloudy, with a low around 62. Northeast wind 10 to 15 mph.
Tuesday
Mostly sunny, with a high near 72. Breezy, with a northeast wind 15 to 20 mph.
Tuesday Night
Partly cloudy, with a low around 65. East wind around 15 mph.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 71. Breezy, with an east wind around 20 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:
2:07 pm CDT Apr 1, 2026
Forecast Valid:
9pm CDT Apr 1, 2026-6pm CDT Apr 8, 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