National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

Partly Cloudy

91°F

33°C

Humidity 54%
Wind Speed W 8 mph
Barometer 30.07 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 20 Aug 12:15 pm CDT
Extended Forecast for

15 Miles SW Grand Isle LA

Heat Advisory August 20, 12:32pm until August 20, 08:00pm
Extreme Heat Warning August 21, 11:00am until August 21, 08:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning
  •  
    Heat Advisory August 20, 12:32pm until August 20, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • This Afternoon

    High: 91 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 81. Southwest wind 5 to 10 mph.

    Low: 81 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 91. West wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 20%.

    High: 91 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 81. West wind around 10 mph.

    Low: 81 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 91. Northwest wind around 10 mph.

    High: 91 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 82. West wind 5 to 10 mph.

    Low: 82 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 91. Northwest wind 5 to 10 mph.

    High: 91 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 81. West wind around 5 mph.

    Low: 81 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 91. Southwest wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 81. Southwest wind 5 to 10 mph.
Friday
A slight chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 91. West wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 20%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 81. West wind around 10 mph.
Saturday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 91. Northwest wind around 10 mph.
Saturday Night
Partly cloudy, with a low around 82. West wind 5 to 10 mph.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 91. Northwest wind 5 to 10 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 81. West wind around 5 mph.
Monday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. West wind around 5 mph.
Monday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 80. Southwest wind around 5 mph.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. West wind around 5 mph.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 80. Southwest wind around 5 mph.
Wednesday
A chance of showers and thunderstorms. Sunny, with a high near 90. West wind around 5 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
15 Miles SW Grand Isle LA
 29.1°N 90.2°W
Last Update:
11:22 am CDT Aug 20, 2026
Forecast Valid:
12pm CDT Aug 20, 2026-6pm CDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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