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

Risks of Severe Thunderstorms and Excessive Rainfall; Fire Weather Concerns and Record Warmth

Severe thunderstorms and flash flooding risks increase across the center of the nation today. Meanwhile, ongoing thunderstorms and flash flooding will linger along the Gulf Coast states through the evening. The Great Basin and Intermountain West, warm temperatures and dry fuels with dry lightning may enhance fire weather potential. In addition, across interior Alaska, Red Flag Warning are posted. Read More >

Hazardous Weather Conditions

Current conditions at

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

Partly Cloudy

81°F

27°C

Humidity 86%
Wind Speed S 7 mph
Barometer 29.97 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 20 Jun 6:15 am CDT
Extended Forecast for

15 Miles SW Grand Isle LA

Heat Advisory June 20, 12:00pm until June 20, 06:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Partly sunny, with a high near 89. South wind around 10 mph.

    High: 89 °F

    Partly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 82. South wind 10 to 15 mph.

    Low: 82 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 89. South wind around 10 mph.

    High: 89 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 83. South wind 10 to 15 mph.

    Low: 83 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 89. South wind around 10 mph.

    High: 89 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 82. South wind around 10 mph.

    Low: 82 °F

    Partly Cloudy

  • Tuesday

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

    High: 89 °F

    Sunny

  • Tuesday Night

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

    Low: 82 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. West wind 5 to 10 mph.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Partly sunny, with a high near 89. South wind around 10 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 82. South wind 10 to 15 mph.
Sunday
Partly sunny, with a high near 89. South wind around 10 mph.
Sunday Night
Partly cloudy, with a low around 83. South wind 10 to 15 mph.
Monday
Mostly sunny, with a high near 89. South wind around 10 mph.
Monday Night
Partly cloudy, with a low around 82. South wind around 10 mph.
Tuesday
Sunny, with a high near 89. Southwest wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 82. Southwest wind 5 to 10 mph.
Wednesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. West wind 5 to 10 mph.
Wednesday Night
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 81. West wind 5 to 10 mph.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. West wind 5 to 10 mph.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 81. Southwest wind around 5 mph.
Friday
Mostly sunny, with a high near 89. South 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:
3:36 am CDT Jun 20, 2026
Forecast Valid:
6am CDT Jun 20, 2026-6pm CDT Jun 26, 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