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

Dangerous Heat Wave Continues; Enhanced Area of Severe Thunderstorms Today

A prolonged, dangerous heat wave will continue today in the Midwest and Mississippi Valley, and persist through the Independence Day weekend across the Ohio Valley, Mid-South, and East Coast. Widespread moderate to extreme HeatRisk is forecast. Scattered wind damage and large hail are expected from severe thunderstorms impacting parts of Nebraska into Iowa today. Read More >

Current conditions at

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

Overcast

84°F

29°C

Humidity 77%
Wind Speed Calm
Barometer 30.09 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 3 Jul 10:55 am CDT
Extended Forecast for

Grand Isle LA

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly before noon. Mostly sunny, with a high near 88. East wind around 5 mph.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 83. Southeast wind around 5 mph becoming calm in the evening.

    Low: 83 °F

    Partly Cloudy

  • Independence Day

    Independence Day: A 20 percent chance of showers and thunderstorms before 10am. Sunny, with a high near 88. North wind around 5 mph becoming south in the afternoon.

    High: 88 °F

    Slight Chance
    T-storms then
    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly clear, with a low around 83. South wind around 5 mph becoming west after midnight. Chance of precipitation is 20%.

    Low: 83 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Northwest wind around 5 mph becoming south in the afternoon.

    High: 88 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 82. Southwest wind 5 to 10 mph. Chance of precipitation is 60%.

    Low: 82 °F

    Mostly Clear
    then Showers
    Likely

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms, mainly before 1pm. Sunny, with a high near 88. West wind 5 to 10 mph.

    High: 88 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 83. Southwest wind 5 to 10 mph.

    Low: 83 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms before 1pm. Sunny, with a high near 88. Southwest wind 5 to 10 mph.

    High: 88 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly before noon. Mostly sunny, with a high near 88. East wind around 5 mph.
Tonight
Partly cloudy, with a low around 83. Southeast wind around 5 mph becoming calm in the evening.
Independence Day
A 20 percent chance of showers and thunderstorms before 10am. Sunny, with a high near 88. North wind around 5 mph becoming south in the afternoon.
Saturday Night
A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly clear, with a low around 83. South wind around 5 mph becoming west after midnight. Chance of precipitation is 20%.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Northwest wind around 5 mph becoming south in the afternoon.
Sunday Night
Showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 82. Southwest wind 5 to 10 mph. Chance of precipitation is 60%.
Monday
A 50 percent chance of showers and thunderstorms, mainly before 1pm. Sunny, with a high near 88. West wind 5 to 10 mph.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 83. Southwest wind 5 to 10 mph.
Tuesday
A slight chance of showers and thunderstorms before 1pm. Sunny, with a high near 88. Southwest wind 5 to 10 mph.
Tuesday Night
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 84. Southwest wind 5 to 10 mph.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. Southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 84. Southwest wind 5 to 10 mph.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. Southwest wind around 5 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
4:52 am CDT Jul 3, 2026
Forecast Valid:
11am CDT Jul 3, 2026-6pm CDT Jul 9, 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