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

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Grand Isle LA

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 61. Southeast wind around 15 mph.

    Low: 61 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of sprinkles after 2pm. Mostly cloudy, with a high near 67. Southeast wind 10 to 15 mph.

    High: 67 °F

    Chance
    Sprinkles

  • Wednesday Night

    Wednesday Night: A chance of rain and thunderstorms before 1am, then a slight chance of showers between 1am and 3am, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 62. Southeast wind 5 to 10 mph. Chance of precipitation is 40%.

    Low: 62 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of sprinkles before noon, then a slight chance of showers after noon. Mostly sunny, with a high near 67. Southeast wind around 5 mph. Chance of precipitation is 20%.

    High: 67 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of sprinkles before midnight, then a slight chance of showers after midnight. Mostly cloudy, with a low around 62. Southeast wind around 5 mph. Chance of precipitation is 20%.

    Low: 62 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers. Mostly cloudy, with a high near 66. East wind 5 to 10 mph.

    High: 66 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 57. East wind 10 to 15 mph.

    Low: 57 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly after noon. Mostly cloudy, with a high near 64. East wind around 15 mph. Chance of precipitation is 60%.

    High: 64 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers. Cloudy, with a low around 44. East wind around 15 mph becoming north after midnight.

    Low: 44 °F

    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 61. Southeast wind around 15 mph.
Wednesday
A chance of sprinkles after 2pm. Mostly cloudy, with a high near 67. Southeast wind 10 to 15 mph.
Wednesday Night
A chance of rain and thunderstorms before 1am, then a slight chance of showers between 1am and 3am, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 62. Southeast wind 5 to 10 mph. Chance of precipitation is 40%.
Thursday
A chance of sprinkles before noon, then a slight chance of showers after noon. Mostly sunny, with a high near 67. Southeast wind around 5 mph. Chance of precipitation is 20%.
Thursday Night
A chance of sprinkles before midnight, then a slight chance of showers after midnight. Mostly cloudy, with a low around 62. Southeast wind around 5 mph. Chance of precipitation is 20%.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 66. East wind 5 to 10 mph.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 57. East wind 10 to 15 mph.
Saturday
Showers likely, mainly after noon. Mostly cloudy, with a high near 64. East wind around 15 mph. Chance of precipitation is 60%.
Saturday Night
Showers. Cloudy, with a low around 44. East wind around 15 mph becoming north after midnight.
Sunday
Showers likely, mainly before noon. Mostly cloudy, with a high near 53. Breezy, with a north wind 15 to 20 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 37. Breezy, with a north wind around 20 mph.
Monday
A chance of sprinkles. Mostly sunny, with a high near 48. Breezy, with a north wind 15 to 20 mph.
Monday Night
Partly cloudy, with a low around 39. North wind around 15 mph.
Tuesday
Sunny, with a high near 52. Northeast wind 10 to 15 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:
11:31 pm CST Jan 20, 2026
Forecast Valid:
1am CST Jan 21, 2026-6pm CST Jan 27, 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