Saint Johns River - Great Marsh Island Weather Forecast

    • 66
    • 77

    Becoming Sunny

    • 69
    • 78

    Partly Sunny

    • 69
    • 79

    Chance Rain Showers

    • 65
    • 77

    Chance Rain Showers

    • 62
    • 74

    Slight Chance Rain Showers

    • 57
    • 75

    Partly Sunny

Today 24 Oct Coastal Duval

Sunny. Highs in the upper 70s. Northeast Winds 10 to 15 Mph.

Tonight 24 Oct Coastal Duval

Clear. Not as cool with Lows in the mid 60s. Northeast Winds 10 to 15 Mph.

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  • Temperature Real-Time

Saint Johns River - Great Marsh Island Temperature Statistics

October Temperature

Mayport Naval Station - Adm David L. McDonald Field (2.5 miles)

  • Lowest 12 October, 2025

    62.1 °F

  • Average October

    74.5 °F

  • Highest 7 October, 2025

    84.9 °F

Climate (2020–Present)

Mayport Naval Station - Adm David L. McDonald Field (2.5 miles)

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  • Average Low 2020–2025

    65.8 °F

  • Average 2020–2025

    72.8 °F

  • Average High 2020–2025

    80.1 °F
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