Grand Isle (Outside) Weather Forecast

    • 80
    • 88

    Mostly Sunny

    • 79
    • 87

    Mostly Sunny

    • 80
    • 86

    Mostly Sunny

    • 80
    • 87

    Partly Sunny

    • 80
    • 87

    Mostly Sunny

    • 80
    • 87

    Mostly Sunny

    • 80
    • 86

    Mostly Sunny

Today 12 Sep Coastal Jefferson

Sunny. Near steady temperature in the upper 80s. East Winds 5 to 10 Mph.

Tonight 12 Sep Coastal Jefferson

Mostly clear. Lows in the mid 70s. South Winds around 5 Mph, becoming northwest after midnight.

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Grand Isle (Outside) Temperature Statistics

September Temperature

Port Fourchon (18 miles)

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Climate (2020–Present)

Port Fourchon (18 miles)

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  • Average Low 2020–2020

    77 °F

  • Average 2020–2020

    79.3 °F

  • Average High 2020–2020

    82.3 °F
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