Grand Isle Weather Forecast

    • 49
    • 72

    Becoming Sunny

    • 52
    • 71

    Mostly Sunny

    • 53
    • 73

    Partly Sunny

    • 53
    • 74

    Partly Sunny

    • 55
    • 72

    Partly Sunny

    • 57
    • 71

    Partly Sunny

Today 21 Dec Coastal Bay

Patchy fog this morning. Sunny. Highs in the lower 70s. East Winds around 5 Mph.

Tonight 21 Dec Coastal Bay

Mostly clear. Lows in the lower 50s. Northeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

Grand Isle Temperature Statistics

December Temperature

Tyndall Drone Runway (9.3 miles)

  • Lowest 3 December, 2025

    43.3 °F

  • Average December

    58.2 °F

  • Highest 5 December, 2025

    73.4 °F

Climate (2020–Present)

Tyndall Drone Runway (9.3 miles)

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  • Average Low 2020–2025

    63.1 °F

  • Average 2020–2025

    70.7 °F

  • Average High 2020–2025

    79.4 °F
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