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.

Fair

49°F

9°C

Humidity 64%
Wind Speed NW 3 mph
Barometer 30.42 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 11 Jan 7:15 pm CST
Extended Forecast for

Grand Isle LA

  • Tonight

    Tonight: Partly cloudy, with a low around 48. Breezy, with a northeast wind 20 to 25 mph.

    Low: 48 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: Mostly sunny, with a high near 55. Northeast wind 10 to 15 mph.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 51. Northeast wind around 10 mph.

    Low: 51 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 59. Northeast wind 5 to 10 mph becoming light north in the afternoon.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 54. Light and variable wind becoming west 5 to 10 mph after midnight.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 63. Breezy, with a west wind 10 to 20 mph.

    High: 63 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 45. Windy, with a northwest wind 20 to 30 mph.

    Low: 45 °F

    Mostly Clear
    and Windy

  • Thursday

    Thursday: Sunny, with a high near 52. Breezy, with a north wind 20 to 25 mph decreasing to 10 to 15 mph in the afternoon.

    High: 52 °F

    Sunny and
    Breezy then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 46. Northwest wind 5 to 10 mph.

    Low: 46 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 48. Breezy, with a northeast wind 20 to 25 mph.
Monday
Mostly sunny, with a high near 55. Northeast wind 10 to 15 mph.
Monday Night
Partly cloudy, with a low around 51. Northeast wind around 10 mph.
Tuesday
Partly sunny, with a high near 59. Northeast wind 5 to 10 mph becoming light north in the afternoon.
Tuesday Night
A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 54. Light and variable wind becoming west 5 to 10 mph after midnight.
Wednesday
Mostly sunny, with a high near 63. Breezy, with a west wind 10 to 20 mph.
Wednesday Night
Mostly clear, with a low around 45. Windy, with a northwest wind 20 to 30 mph.
Thursday
Sunny, with a high near 52. Breezy, with a north wind 20 to 25 mph decreasing to 10 to 15 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 46. Northwest wind 5 to 10 mph.
Friday
Sunny, with a high near 61. North wind around 5 mph becoming south in the morning.
Friday Night
Partly cloudy, with a low around 52. South wind 5 to 15 mph becoming northeast after midnight.
Saturday
A slight chance of showers. Mostly sunny, with a high near 61. Northeast wind around 15 mph.
Saturday Night
A slight chance of showers. Mostly cloudy, with a low around 45. Breezy, with a north wind 15 to 20 mph.
Sunday
Sunny, with a high near 55. Breezy, with a north wind 15 to 20 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:
11:33 am CST Jan 11, 2026
Forecast Valid:
7pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation