Grand Isle State Park Weather Forecast

    • 73
    • 78

    Chance Rain Showers

    • 74
    • 78

    Partly Sunny

    • 74
    • 79

    Mostly Cloudy

    • 75
    • 79

    Partly Sunny

    • 75
    • 80

    Partly Sunny

    • 76
    • 80

    Partly Sunny

Today 3 May Coastal Jefferson

Showers with isolated Thunderstorms. Highs in the upper 70s. Southeast Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 3 May Coastal Jefferson

Mostly cloudy. Lows around 70. Southeast Winds 5 to 10 Mph.

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Grand Isle State Park Temperature Statistics

May Temperature

Port Fourchon (17.4 miles)

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  • Average May

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Climate (2019–Present)

Port Fourchon (17.4 miles)

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  • Average Low 2019–2020

    71.4 °F

  • Average 2019–2020

    75.5 °F

  • Average High 2019–2020

    79.5 °F
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