Saint Johns River - Great Marsh Island Weather Forecast

    • 75
    • 85

    Rain Showers

    • 72
    • 81

    Thunderstorms Likely

    • 72
    • 80

    Rain Showers

    • 74
    • 81

    Rain Showers Likely

    • 73
    • 82

    Rain Showers Likely

    • 72
    • 81

    Rain Showers Likely

    • 71
    • 81

    Chance Rain Showers

Today 26 Sep Coastal Duval

Showers with a chance of Thunderstorms. Locally heavy rainfall possible. Highs in the mid 80s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Johns River - Great Marsh Island Temperature Statistics

September Temperature

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

  • Lowest 23 September, 2023

    69.1 °F

  • Average September

    83.3 °F

  • Highest 6 September, 2023

    97.6 °F

Climate (2010–Present)

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

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  • Average Low 2010–Present

    65.4 °F

  • Average 2010–Present

    72 °F

  • Average High 2010–Present

    79.4 °F
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