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.

69°F

21°C

Humidity 92%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 67°F (19°C)
Visibility NA
Last update 1 Apr 4:35 am CDT
Extended Forecast for

15 Miles WSW Grand Isle LA

  • Overnight

    Overnight: A 10 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 67. Southeast wind around 5 mph.

    Low: 67 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 79. Southeast wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 79 °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 68. Southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 80. Southeast wind 10 to 15 mph. Chance of precipitation is 50%.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • 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 68. Southeast wind around 10 mph. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday

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

    High: 80 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 68. Southeast wind around 10 mph. Chance of precipitation is 10%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 80. Southeast wind around 10 mph.

    High: 80 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind around 5 mph.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 10 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 67. Southeast wind around 5 mph.
Wednesday
A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 79. Southeast wind 5 to 10 mph. Chance of precipitation is 70%. 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 68. Southeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 80. Southeast wind 10 to 15 mph. Chance of precipitation is 50%.
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 68. Southeast wind around 10 mph. Chance of precipitation is 20%.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. Southeast wind 10 to 15 mph.
Friday Night
A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 68. Southeast wind around 10 mph. Chance of precipitation is 10%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 80. Southeast wind around 10 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind around 5 mph.
Sunday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 77. North wind 5 to 10 mph.
Sunday Night
A chance of showers and thunderstorms. Cloudy, with a low around 57. Northeast wind 10 to 15 mph.
Monday
A slight chance of showers. 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 75. Northeast wind 10 to 15 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
15 Miles WSW Grand Isle LA
 29.13°N 90.2°W
Last Update:
2:02 am CDT Apr 1, 2026
Forecast Valid:
4am CDT Apr 1, 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