Nassau River - Back River Weather Forecast

    • 78
    • 93

    Mostly Sunny

    • 77
    • 92

    Mostly Sunny

    • 77
    • 92

    Partly Sunny

    • 77
    • 94

    Chance Thunderstorms

    • 77
    • 93

    Chance Thunderstorms

    • 78
    • 93

    Slight Chance Thunderstorms

Today 22 Jul Coastal Duval

Sunny. Highs in the mid 90s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Heat index Values up to 107.

Tonight 22 Jul Coastal Duval

Partly cloudy. Lows in the upper 70s. South Winds 15 to 20 Mph.

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Nassau River - Back River Temperature Statistics

July Temperature

Fernandina Beach Municipal Airport (4.3 miles)

  • Lowest 13 July, 2026

    71.6 °F

  • Average July

    83 °F

  • Highest 6 July, 2026

    95 °F

Climate (2021–2026)

Fernandina Beach Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    62.8 °F

  • Average 2021–2026

    70.1 °F

  • Average High 2021–2026

    78.3 °F
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