Grand Isle Weather Forecast

    • 65
    • 76

    Slight Chance Thunderstorms

    • 68
    • 74

    Chance Rain Showers

    • 72
    • 76

    Chance Thunderstorms

    • 74
    • 79

    Mostly Sunny

    • 76
    • 79

    Mostly Sunny

    • 76
    • 81

    Partly Sunny

    • 76
    • 81

    Partly Sunny

Today 10 May Coastal Jefferson

Partly sunny. Highs in the mid 70s. Northwest Winds around 10 Mph.

Tonight 10 May Coastal Jefferson

Partly cloudy. A chance of Showers this evening. Lows around 60. Northwest Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight. Chance of rain 30 percent.

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Grand Isle Temperature Statistics

May Temperature

Port Fourchon (14.9 miles)

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  • Average May

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Climate (2020–Present)

Port Fourchon (14.9 miles)

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  • Average Low 2020–2020

    78.8 °F

  • Average 2020–2020

    82.4 °F

  • Average High 2020–2020

    85.8 °F
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