Saint Johns River Mouth Weather Forecast

    • 71
    • 80

    Chance Rain Showers

    • 72
    • 82

    Mostly Sunny

    • 73
    • 87

    Mostly Sunny

    • 75
    • 87

    Partly Sunny

    • 75
    • 89

    Partly Sunny

    • 76
    • 87

    Partly Sunny

    • 77
    • 88

    Mostly Sunny

Today 13 May Coastal Duval

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs in the mid 80s. Southwest Winds around 10 Mph. Chance of rain 20 percent.

Tonight 13 May Coastal Duval

Partly cloudy early this Evening, then becoming mostly clear. A slight chance of Showers early this evening. Lows in the upper 60s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Johns River Mouth Temperature Statistics

May Temperature

Mayport Naval Station - Adm David L. McDonald Field (1.9 miles)

  • Lowest 1 May, 2025

    65.6 °F

  • Average May

    80.6 °F

  • Highest 5 May, 2025

    92.6 °F

Climate (2020–Present)

Mayport Naval Station - Adm David L. McDonald Field (1.9 miles)

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  • Average Low 2020–2025

    65.6 °F

  • Average 2020–2025

    72.5 °F

  • Average High 2020–2025

    79.9 °F
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