Grand Isle State Park Weather Forecast

    • 85
    • 91

    Partly Sunny

    • 83
    • 90

    Slight Chance Thunderstorms

    • 85
    • 89

    Slight Chance Thunderstorms

    • 82
    • 89

    Chance Thunderstorms

    • 81
    • 88

    Chance Thunderstorms

Today 23 Aug Coastal Jefferson

Sunny. A slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the upper 90s. West Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 112.

Tonight 23 Aug Coastal Jefferson

Mostly clear. Near steady temperature in the lower 80s. West Winds around 5 Mph.

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Grand Isle State Park Temperature Statistics

August Temperature

Port Fourchon (17.4 miles)

  • Lowest

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  • Average August

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Climate (–)

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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