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

73°F

23°C

Humidity 87%
Wind Speed SE 5 mph
Barometer 30.04 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 2 Apr 2:55 am CDT
Extended Forecast for

Grand Isle LA

  • Overnight

    Overnight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 70. Southeast wind around 15 mph.

    Low: 70 °F

    Patchy Fog

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 75. Southeast wind around 15 mph.

    High: 75 °F

    Patchy Fog
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 71. Southeast wind around 15 mph.

    Low: 71 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 76. Southeast wind 10 to 15 mph.

    High: 76 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 71. Southeast wind 10 to 15 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 chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Southeast wind 5 to 10 mph. Chance of precipitation is 60%.

    Low: 69 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. South wind 5 to 10 mph becoming north in the morning. Chance of precipitation is 70%.

    High: 74 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Cloudy, with a low around 62. Breezy, with a northeast wind 15 to 20 mph.

    Low: 62 °F

    Chance
    Showers and
    Breezy

Detailed Forecast

Overnight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 70. Southeast wind around 15 mph.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 75. Southeast wind around 15 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 71. Southeast wind around 15 mph.
Friday
Partly sunny, with a high near 76. Southeast wind 10 to 15 mph.
Friday Night
Partly cloudy, with a low around 71. Southeast wind 10 to 15 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 chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Southeast wind 5 to 10 mph. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. South wind 5 to 10 mph becoming north in the morning. Chance of precipitation is 70%.
Sunday Night
A chance of showers and thunderstorms. Cloudy, with a low around 62. Breezy, with a northeast wind 15 to 20 mph.
Monday
A chance of showers, mainly before 1pm. Cloudy, with a high near 67. Breezy, with a northeast wind 15 to 25 mph.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 61. Breezy, with a northeast wind 15 to 20 mph.
Tuesday
Mostly sunny, with a high near 71. Breezy, with a northeast wind 15 to 20 mph.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 65. Breezy, with an east wind 15 to 20 mph.
Wednesday
A chance of showers. Partly sunny, with a high near 71. Breezy, with an east wind around 25 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
2:02 am CDT Apr 2, 2026
Forecast Valid:
3am CDT Apr 2, 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