Nassau Sound Weather Forecast

    • 78
    • 85

    Chance Thunderstorms

    • 80
    • 85

    Mostly Sunny

    • 79
    • 84

    Rain Showers Likely

    • 78
    • 81

    Breezy

    • 77
    • 82

    Chance Thunderstorms

    • 76
    • 83

    Chance Thunderstorms

    • 76
    • 84

    Chance Thunderstorms

Today 13 Sep Coastal Duval

Showers likely with a chance of Thunderstorms. Highs in the lower 90s. South Winds around 5 Mph. Chance of rain 60 percent. Heat index Values up to 106.

Tonight 13 Sep Coastal Duval

Mostly cloudy with a chance of Showers and Thunderstorms this Evening, then partly cloudy after midnight. Lows in the upper 70s. South Winds around 5 Mph, becoming southwest after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Nassau Sound Temperature Statistics

September Temperature

Mayport Naval Station - Adm David L. McDonald Field (6.8 miles)

  • Lowest 11 September, 2026

    78.1 °F

  • Average September

    83.6 °F

  • Highest 10 September, 2026

    90 °F

Climate (2021–2026)

Mayport Naval Station - Adm David L. McDonald Field (6.8 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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