Severe Thunderstorms and Heavy Rain in the Central Plains; Dry Thunderstorms and Critical Fire Weather in the West

Severe thunderstorms and heavy rain may produce large to very-large hail, severe winds, tornadoes and numerous instances of flash flooding across portions of the central Plains. Scattered slow-moving storms will continue to bring a flash flooding threat to the central Gulf Coast. Elevated to critical fire weather conditions are expected across much of the western U.S.. Read More >

Current conditions at

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

Fair

81°F

27°C

Humidity 85%
Wind Speed S 5 mph
Barometer 29.99 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 20 Jun 3:35 am CDT
Extended Forecast for

Grand Isle LA

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

    Overnight: Mostly cloudy, with a low around 82. South wind around 10 mph.

    Low: 82 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 3pm.  Partly sunny, with a high near 87. South wind around 10 mph.

    High: 87 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms, mainly between 8pm and 11pm.  Mostly cloudy, with a low around 83. South wind 10 to 15 mph.

    Low: 83 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 87. South wind 10 to 15 mph.

    High: 87 °F

    Partly Sunny

  • Sunday Night

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

    Low: 83 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 88. South wind 10 to 15 mph.

    High: 88 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 83. South wind around 10 mph.

    Low: 83 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 88. Southwest wind 5 to 10 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

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

    Low: 82 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 82. South wind around 10 mph.
Saturday
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Partly sunny, with a high near 87. South wind around 10 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms, mainly between 8pm and 11pm. Mostly cloudy, with a low around 83. South wind 10 to 15 mph.
Sunday
Partly sunny, with a high near 87. South wind 10 to 15 mph.
Sunday Night
Partly cloudy, with a low around 83. South wind around 15 mph.
Monday
Mostly sunny, with a high near 88. South wind 10 to 15 mph.
Monday Night
Partly cloudy, with a low around 83. South wind around 10 mph.
Tuesday
Sunny, with a high near 88. Southwest wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 82. Southwest wind around 10 mph.
Wednesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. West wind 5 to 10 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. West wind 5 to 10 mph.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southwest wind 5 to 10 mph.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southwest wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 87. South wind around 5 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
3:36 am CDT Jun 20, 2026
3am CDT Jun 20, 2026-6pm CDT Jun 26, 2026
 
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Additional Resources

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Hourly Weather Forecast

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