Grand Isle Weather Forecast

    • 82
    • 88

    Mostly Sunny

    • 82
    • 89

    Mostly Sunny

    • 82
    • 88

    Rain Showers

    • 81
    • 87

    Mostly Sunny

    • 81
    • 87

    Chance Thunderstorms

    • 81
    • 86

    Rain Showers Likely

Today 14 Sep Coastal Jefferson

Sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs around 90. Northwest Winds around 5 Mph, becoming southeast this afternoon. Chance of rain 20 percent. Heat index Values up to 105.

Tonight 14 Sep Coastal Jefferson

Mostly clear. Humid with Lows in the upper 70s. Southwest Winds around 5 Mph, becoming northwest after midnight.

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Grand Isle Temperature Statistics

September Temperature

Port Fourchon (14.9 miles)

  • Lowest

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  • Average September

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  • Highest

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Climate (–)

Port Fourchon (14.9 miles)

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  • Average Low –

    71.6 °F

  • Average –

    72.5 °F

  • Average High –

    75.2 °F
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