Grand Isle (Outside) Weather Forecast

    • 83
    • 88

    Thunderstorms

    • 83
    • 88

    Rain Showers

    • 83
    • 88

    Chance Thunderstorms

    • 83
    • 88

    Chance Thunderstorms

    • 82
    • 89

    Chance Thunderstorms

    • 80
    • 89

    Thunderstorms Likely

Today 18 Jul Coastal Jefferson

Showers and Thunderstorms. Some Thunderstorms may produce heavy rainfall. Humid with Highs in the mid 80s. Southwest Winds 10 to 15 Mph. Chance of rain 90 percent.

Tonight 18 Jul Coastal Jefferson

Mostly cloudy with a chance of Showers. A chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall in the evening. Humid. Near steady temperature in the lower 80s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

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Grand Isle (Outside) Temperature Statistics

July Temperature

Port Fourchon (18 miles)

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  • Average July

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Climate (2020–Present)

Port Fourchon (18 miles)

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  • Average Low 2020–2020

    79.8 °F

  • Average 2020–2020

    83.3 °F

  • Average High 2020–2020

    86.6 °F
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