Grand Isle SPB Weather Forecast

    • 68
    • 76

    Rain Showers

    • 67
    • 76

    Rain Showers Likely

    • 68
    • 75

    Chance Thunderstorms

    • 71
    • 76

    Chance Rain Showers

    • 74
    • 79

    Mostly Sunny

    • 75
    • 79

    Mostly Sunny

Today 9 May Coastal Jefferson

Showers. A chance of Thunderstorms this Morning, then Thunderstorms likely this afternoon. Near steady temperature in the mid 70s. Northeast Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 9 May Coastal Jefferson

Mostly cloudy. Showers and Thunderstorms Likely, mainly in the evening. Lows in the mid 60s. Northeast Winds 10 to 15 Mph. Chance of rain 70 percent.

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Grand Isle SPB Temperature Statistics

May Temperature

Port Fourchon (17.4 miles)

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  • Average May

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Climate (2020–Present)

Port Fourchon (17.4 miles)

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  • Average Low 2020–2020

    78.7 °F

  • Average 2020–2020

    82.3 °F

  • Average High 2020–2020

    85.7 °F
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