Grand Isle State Park Weather Forecast

    • 82
    • 87

    Mostly Sunny

    • 82
    • 88

    Slight Chance Thunderstorms

    • 82
    • 88

    Mostly Sunny

    • 81
    • 88

    Mostly Sunny

    • 80
    • 87

    Mostly Sunny

    • 80
    • 86

    Partly Sunny

Today 20 Sep Coastal Jefferson

Sunny. Highs around 90. Northeast Winds around 5 Mph, becoming southeast around 5 Mph this afternoon.

Tonight 20 Sep Coastal Jefferson

Mostly clear. Humid with Lows in the upper 70s. South Winds around 5 Mph in the Evening, becoming light and variable.

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Grand Isle State Park Temperature Statistics

September Temperature

Port Fourchon (17.4 miles)

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  • Average September

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Climate (–)

Port Fourchon (17.4 miles)

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  • Average Low –

    71.6 °F

  • Average –

    72.5 °F

  • Average High –

    75.2 °F
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