Grand Isle State Park Weather Forecast

    • 47
    • 52

    Mostly Sunny

    • 58
    • 62

    Mostly Cloudy

    • 62
    • 66

    Mostly Cloudy

    • 56
    • 69

    Chance Rain Showers

    • 57
    • 62

    Partly Sunny

    • 62
    • 68

    Partly Sunny

Today 15 Dec Coastal Jefferson

Sunny, cooler with Highs in the upper 40s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 15 Dec Coastal Jefferson

Mostly clear and brisk. Much cooler with Lows in the lower 30s. Northeast Winds 20 to 25 Mph.

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Grand Isle State Park Temperature Statistics

December Temperature

Port Fourchon (17.4 miles)

  • Lowest

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  • Average December

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  • Highest

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Climate (–Present)

Port Fourchon (17.4 miles)

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  • Average Low –

    71.6 °F

  • Average –

    72.5 °F

  • Average High –

    75.2 °F
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