Saint Johns River - Great Marsh Island Weather Forecast

    • 40
    • 73

    Becoming Sunny

    • 42
    • 51

    Partly Sunny

    • 49
    • 61

    Mostly Sunny

    • 56
    • 67

    Mostly Cloudy

    • 57
    • 73

    Slight Chance Rain Showers

    • 53
    • 71

    Mostly Sunny

    • 56
    • 70

    Partly Sunny

Today 14 Dec Coastal Duval

Mostly sunny. Highs in the lower 70s. Temperature falling into the mid 60s. Northwest Winds 15 to 20 Mph.

Tonight 14 Dec Coastal Duval

Mostly clear and Breezy, cooler with Lows in the upper 30s. North Winds 15 to 25 Mph with Gusts up to 35 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Johns River - Great Marsh Island Temperature Statistics

December Temperature

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

  • Lowest 12 December, 2025

    44.1 °F

  • Average December

    58.2 °F

  • Highest 5 December, 2025

    80.1 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    65.6 °F

  • Average 2020–2025

    72.7 °F

  • Average High 2020–2025

    80 °F
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