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

78°F

26°C

Humidity 68%
Wind Speed SE 8 mph
Barometer 30.12 in
Dewpoint 67°F (19°C)
Visibility NA
Heat Index80°F (27°C)
Last update 31 Mar 3:35 pm CDT
Extended Forecast for

15 Miles WSW Grand Isle LA

  • This Afternoon

    This Afternoon: A 50 percent chance of showers and thunderstorms, mainly before 5pm. Mostly sunny, with a high near 79. Southeast wind around 10 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 67. Southeast wind around 5 mph. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly before 2pm. Mostly sunny, with a high near 80. Southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 67. Southeast wind around 10 mph.

    Low: 67 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80. Southeast wind 10 to 15 mph.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. Southeast wind around 10 mph.

    Low: 68 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 79. Southeast wind 10 to 15 mph.

    High: 79 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 69. Southeast wind around 10 mph.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. Southeast wind around 10 mph.

    High: 81 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms, mainly before 5pm. Mostly sunny, with a high near 79. Southeast wind around 10 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 67. Southeast wind around 5 mph. Chance of precipitation is 20%.
Wednesday
Showers and thunderstorms likely, mainly before 2pm. Mostly sunny, with a high near 80. Southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 67. Southeast wind around 10 mph.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80. Southeast wind 10 to 15 mph.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. Southeast wind around 10 mph.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 79. Southeast wind 10 to 15 mph.
Friday Night
Partly cloudy, with a low around 69. Southeast wind around 10 mph.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. Southeast wind around 10 mph.
Saturday Night
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 65. Southeast wind around 5 mph.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 76. North wind 5 to 10 mph.
Sunday Night
A chance of showers and thunderstorms. Cloudy, with a low around 56. North wind around 10 mph, with gusts as high as 20 mph.
Monday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 71. Northeast wind 10 to 15 mph.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 58. Northeast wind around 10 mph.
Tuesday
Mostly sunny, with a high near 74. Northeast wind 10 to 15 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
15 Miles WSW Grand Isle LA
 29.13°N 90.2°W
Last Update:
2:01 pm CDT Mar 31, 2026
Forecast Valid:
3pm CDT Mar 31, 2026-6pm CDT Apr 7, 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