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.

Fog/Mist

70°F

21°C

Humidity 93%
Wind Speed S 15 mph
Barometer 29.86 in
Dewpoint 68°F (20°C)
Visibility 4.00 mi
Last update 19 Feb 1:15 am CST
Extended Forecast for

Grand Isle LA

Dense Fog Advisory until February 19, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until February 19, 09:00am

    NOW until 9:00am Thu

    Dense Fog Advisory

  • Overnight

    Low: 65 °F

    Areas Dense
    Fog

  • Thursday

    Thursday: Areas of dense fog before 8am. Otherwise, partly sunny, with a high near 70. South wind around 15 mph.

    High: 70 °F

    Areas Dense
    Fog then
    Partly Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 65. South wind 10 to 15 mph.

    Low: 65 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: A 30 percent chance of showers, mainly after noon. Cloudy, then gradually becoming mostly sunny, with a high near 70. South wind 5 to 10 mph.

    High: 70 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 66. South wind 10 to 15 mph.

    Low: 66 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers after noon. Mostly cloudy, with a high near 71. South wind around 10 mph.

    High: 71 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 53. Windy, with a southwest wind 10 to 20 mph becoming north 20 to 30 mph after midnight. Chance of precipitation is 40%.

    Low: 53 °F

    Chance
    Showers and
    Windy

  • Sunday

    Sunday: Sunny, with a high near 60. Windy, with a north wind 20 to 30 mph.

    High: 60 °F

    Sunny and
    Windy

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, mostly cloudy, with a low around 65. South wind around 15 mph.
Thursday
Areas of dense fog before 8am. Otherwise, partly sunny, with a high near 70. South wind around 15 mph.
Thursday Night
Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 65. South wind 10 to 15 mph.
Friday
A 30 percent chance of showers, mainly after noon. Cloudy, then gradually becoming mostly sunny, with a high near 70. South wind 5 to 10 mph.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 66. South wind 10 to 15 mph.
Saturday
A 30 percent chance of showers after noon. Mostly cloudy, with a high near 71. South wind around 10 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 53. Windy, with a southwest wind 10 to 20 mph becoming north 20 to 30 mph after midnight. Chance of precipitation is 40%.
Sunday
Sunny, with a high near 60. Windy, with a north wind 20 to 30 mph.
Sunday Night
Partly cloudy, with a low around 47. Windy, with a north wind 25 to 30 mph.
Monday
Sunny, with a high near 57. Breezy, with a north wind 15 to 25 mph.
Monday Night
Mostly clear, with a low around 45. Breezy, with a north wind 15 to 20 mph.
Tuesday
Sunny, with a high near 58. Northeast wind 5 to 15 mph becoming southeast in the afternoon.
Tuesday Night
Partly cloudy, with a low around 52. South wind 5 to 15 mph.
Wednesday
Partly sunny, with a high near 67. South wind around 15 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:
11:32 pm CST Feb 18, 2026
Forecast Valid:
1am CST Feb 19, 2026-6pm CST Feb 25, 2026
 
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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