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.

Mostly Cloudy

90°F

32°C

Humidity 60%
Wind Speed NE 6 mph
Barometer 30.22 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 15 Aug 11:35 am CDT
Extended Forecast for

Grand Isle LA

Extreme Heat Watch August 17, 11:00am until August 17, 08:00pm
Extreme Heat Warning August 16, 11:00am until August 16, 08:00pm
Extreme Heat Warning August 15, 11:52am until August 15, 08:00pm
Click here for hazard details and duration
Extreme Heat Watch
Extreme Heat Warning
Extreme Heat Warning
  •  
    Extreme Heat Warning August 15, 11:52am until August 15, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Today

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 83. South wind around 5 mph becoming west after midnight.

    Low: 83 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 89. Northwest wind around 5 mph becoming southeast in the afternoon.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 83. Southwest wind around 5 mph.

    Low: 83 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 89. Southwest wind 5 to 10 mph.

    High: 89 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 84. Southwest wind around 10 mph.

    Low: 84 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90. Southwest wind 5 to 10 mph.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 83. West wind 10 to 15 mph.

    Low: 83 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 89. North wind around 5 mph becoming south in the afternoon.
Tonight
Mostly clear, with a low around 83. South wind around 5 mph becoming west after midnight.
Sunday
Sunny, with a high near 89. Northwest wind around 5 mph becoming southeast in the afternoon.
Sunday Night
Mostly clear, with a low around 83. Southwest wind around 5 mph.
Monday
Sunny, with a high near 89. Southwest wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 84. Southwest wind around 10 mph.
Tuesday
Mostly sunny, with a high near 90. Southwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 83. West wind 10 to 15 mph.
Wednesday
Sunny, with a high near 89. West wind around 10 mph.
Wednesday Night
Mostly clear, with a low around 83. West wind 10 to 15 mph.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 90. Southwest wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 83. West wind 10 to 15 mph.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. West wind 5 to 10 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:
11:17 am CDT Aug 15, 2026
Forecast Valid:
11am CDT Aug 15, 2026-6pm CDT Aug 21, 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