Nassau River - Back River Weather Forecast

    • 71
    • 86

    Partly Sunny

    • 72
    • 84

    Mostly Sunny

    • 73
    • 84

    Chance Thunderstorms

    • 74
    • 83

    Chance Thunderstorms

    • 73
    • 83

    Chance Thunderstorms

    • 73
    • 86

    Chance Thunderstorms

Today 18 Sep Coastal Duval

Mostly sunny. Highs in the upper 80s. East Winds 10 to 15 Mph.

Tonight 18 Sep Coastal Duval

Partly cloudy this Evening, then clearing. Lows around 70. East Winds 10 to 15 Mph, becoming north northwest and Diminishing to around 5 Mph after midnight.

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Nassau River - Back River Temperature Statistics

September Temperature

Fernandina Beach Municipal Airport (4.3 miles)

  • Lowest 15 September, 2025

    66.2 °F

  • Average September

    77.2 °F

  • Highest 6 September, 2025

    87.8 °F

Climate (2020–Present)

Fernandina Beach Municipal Airport (4.3 miles)

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  • Average Low 2020–2025

    62.2 °F

  • Average 2020–2025

    69.6 °F

  • Average High 2020–2025

    77.7 °F
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