Saint Johns River - Great Marsh Island Weather Forecast

    • 80
    • 97

    Slight Chance Thunderstorms

    • 78
    • 97

    Chance Thunderstorms

    • 76
    • 96

    Thunderstorms Likely

    • 75
    • 91

    Thunderstorms

    • 76
    • 88

    Thunderstorms Likely

    • 77
    • 90

    Chance Thunderstorms

Today 10 Jul Coastal Duval

Mostly sunny. Highs in the upper 90s. West southwest Winds 5 to 10 Mph, becoming southeast 10 to 15 Mph with Gusts up to 25 Mph late this afternoon. Heat index Values up to 111.

Tonight 10 Jul Coastal Duval

Partly cloudy. A slight chance of Showers and Thunderstorms early in the evening. Lows in the upper 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph in the Evening, becoming west southwest 5 to 10 Mph after midnight. Chance of rain 20 percent.

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  • Temperature Real-Time

Saint Johns River - Great Marsh Island Temperature Statistics

July Temperature

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

  • Lowest 7 July, 2026

    75 °F

  • Average July

    83.1 °F

  • Highest 7 July, 2026

    95 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    65.6 °F

  • Average 2021–2026

    72.7 °F

  • Average High 2021–2026

    80 °F
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