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

77°F

25°C

Humidity 85%
Wind Speed Calm
Barometer 30.11 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 20 Jun 11:55 pm CDT
Extended Forecast for

Grand Isle LA

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 85. South wind around 5 mph.

    Low: 85 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers and thunderstorms between 1pm and 2pm. Sunny, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 88 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly clear, with a steady temperature around 86. Southeast wind 5 to 10 mph. Chance of precipitation is 30%.

    Low: 86 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms. Sunny, with a high near 88. Southeast wind 5 to 10 mph.

    High: 88 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly clear, with a low around 82. Southeast wind around 10 mph.

    Low: 82 °F

    Chance
    T-storms

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Sunny, with a high near 88. East wind 10 to 15 mph. Chance of precipitation is 70%.

    High: 88 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 82. Southeast wind 10 to 15 mph. Chance of precipitation is 60%.

    Low: 82 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 88. Southeast wind 10 to 15 mph. Chance of precipitation is 80%.

    High: 88 °F

    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southeast wind 10 to 15 mph.

    Low: 82 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 85. South wind around 5 mph.
Saturday
A slight chance of showers and thunderstorms between 1pm and 2pm. Sunny, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 20%.
Saturday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly clear, with a steady temperature around 86. Southeast wind 5 to 10 mph. Chance of precipitation is 30%.
Sunday
A 50 percent chance of showers and thunderstorms. Sunny, with a high near 88. Southeast wind 5 to 10 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly clear, with a low around 82. Southeast wind around 10 mph.
Monday
Showers likely and possibly a thunderstorm. Sunny, with a high near 88. East wind 10 to 15 mph. Chance of precipitation is 70%.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 82. Southeast wind 10 to 15 mph. Chance of precipitation is 60%.
Tuesday
Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 88. Southeast wind 10 to 15 mph. Chance of precipitation is 80%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southeast wind 10 to 15 mph.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southeast wind around 10 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southeast wind around 10 mph.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. East wind around 10 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 82. Southeast wind around 10 mph.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Southeast wind 5 to 10 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
11:35 pm CDT Jun 20, 2025
Forecast Valid:
12am CDT Jun 21, 2025-6pm CDT Jun 27, 2025
 
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