Grand Isle State Park Weather Forecast

    • 80
    • 87

    Chance Thunderstorms

    • 81
    • 88

    Thunderstorms Likely

    • 82
    • 90

    Chance Thunderstorms

    • 82
    • 90

    Slight Chance Thunderstorms

    • 82
    • 90

    Chance Thunderstorms

    • 81
    • 88

    Thunderstorms Likely

Today 1 Jul Coastal Jefferson

Mostly sunny with a chance of Thunderstorms. A chance of Showers. Humid with Highs in the upper 80s. West Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 1 Jul Coastal Jefferson

Mostly cloudy. Near steady temperature around 80. Southwest Winds around 5 Mph.

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Grand Isle State Park Temperature Statistics

July Temperature

Port Fourchon (17.4 miles)

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  • Average July

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Climate (2020–Present)

Port Fourchon (17.4 miles)

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  • Average Low 2020–2020

    79.7 °F

  • Average 2020–2020

    83.5 °F

  • Average High 2020–2020

    86.9 °F
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