Nassau Sound - Simpson Creek Entrance Weather Forecast

    • 73
    • 84

    Decreasing Clouds

    • 74
    • 84

    Mostly Sunny

    • 75
    • 84

    Mostly Sunny

    • 76
    • 83

    Chance Rain Showers

    • 76
    • 82

    Chance Thunderstorms

    • 75
    • 82

    Chance Thunderstorms

    • 74
    • 84

    Chance Thunderstorms

Today 17 Sep Coastal Duval

Mostly sunny. Highs in the upper 80s. East Winds increasing to around 10 Mph this afternoon.

Tonight 17 Sep Coastal Duval

Mostly cloudy this Evening, then becoming partly cloudy. Lows in the upper 60s. Southeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Nassau Sound - Simpson Creek Entrance Temperature Statistics

September Temperature

Mayport Naval Station - Adm David L. McDonald Field (6.2 miles)

  • Lowest 15 September, 2025

    70 °F

  • Average September

    78.7 °F

  • Highest 6 September, 2025

    87.1 °F

Climate (2020–Present)

Mayport Naval Station - Adm David L. McDonald Field (6.2 miles)

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  • Average Low 2020–2025

    65.8 °F

  • Average 2020–2025

    72.8 °F

  • Average High 2020–2025

    80.1 °F
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