Saint Johns River - Great Marsh Island Weather Forecast

    • 77
    • 88

    Chance Thunderstorms

    • 78
    • 90

    Chance Thunderstorms

    • 78
    • 91

    Chance Thunderstorms

    • 79
    • 95

    Chance Thunderstorms

    • 79
    • 97

    Chance Thunderstorms

    • 78
    • 96

    Chance Thunderstorms

Today 23 Jul Coastal Duval

Partly sunny. A chance of Showers and Thunderstorms this Morning, then Showers with Thunderstorms likely this afternoon. Some Thunderstorms may produce gusty Winds and heavy rainfall this afternoon. Highs in the upper 80s. Northeast Winds 5 to 10 Mph, becoming east this afternoon. Chance of rain 80 percent.

Tonight 23 Jul Coastal Duval

Partly cloudy with Showers and Thunderstorms likely in the Evening, then mostly clear after midnight. Lows in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.

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Saint Johns River - Great Marsh Island Temperature Statistics

July Temperature

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

  • Lowest 11 July, 2025

    75.7 °F

  • Average July

    86.3 °F

  • Highest 11 July, 2025

    99.6 °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

    72.7 °F

  • Average High 2020–2025

    80.1 °F
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