Grand Isle State Park Weather Forecast

    • 82
    • 87

    Slight Chance Thunderstorms

    • 82
    • 88

    Rain Showers Likely

    • 81
    • 87

    Rain Showers Likely

    • 81
    • 87

    Rain Showers Likely

    • 82
    • 87

    Chance Thunderstorms

    • 81
    • 87

    Chance Thunderstorms

Today 6 Sep Coastal Jefferson

Mostly sunny. A chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. Northwest Winds around 5 Mph, becoming southwest this afternoon. Chance of rain 40 percent.

Tonight 6 Sep Coastal Jefferson

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Humid with Lows in the upper 70s. West Winds around 5 Mph. Chance of rain 20 percent.

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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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