Grand Isle State Park Weather Forecast

    • 63
    • 71

    Rain Showers

    • 61
    • 68

    Cloudy

    • 57
    • 66

    Mostly Cloudy

    • 56
    • 65

    Mostly Cloudy

    • 56
    • 64

    Mostly Sunny

    • 60
    • 64

    Partly Sunny

Today 2 Dec Coastal Jefferson

A chance of Thunderstorms. Showers. Highs in the mid 70s. South Winds 10 to 15 Mph. Chance of rain 90 percent.

Tonight 2 Dec Coastal Jefferson

Cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. Southwest Winds 5 to 10 Mph, becoming west after midnight. Chance of rain 70 percent.

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Grand Isle State Park Temperature Statistics

December Temperature

Port Fourchon (17.4 miles)

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Climate (2018–Present)

Port Fourchon (17.4 miles)

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  • Average Low 2018–2022

    68.9 °F

  • Average 2018–2022

    73.2 °F

  • Average High 2018–2022

    77.2 °F
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