Grand Isle State Park Weather Forecast

    • 80
    • 86

    Partly Sunny

    • 79
    • 86

    Mostly Sunny

    • 80
    • 85

    Sunny

    • 79
    • 85

    Mostly Sunny

    • 79
    • 85

    Slight Chance Thunderstorms

    • 80
    • 86

    Mostly Sunny

Today 15 Sep Coastal Jefferson

Mostly sunny. Highs in the upper 80s. North Winds around 5 Mph, becoming east in the afternoon.

Tonight 15 Sep Coastal Jefferson

Partly cloudy. Near steady temperature in the upper 70s. West Winds around 5 Mph.

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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 (2020–Present)

Port Fourchon (17.4 miles)

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  • Average Low 2020–2020

    76.9 °F

  • Average 2020–2020

    79.1 °F

  • Average High 2020–2020

    82.2 °F
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