Mill Cove - New Castle Island Weather Forecast

    • 77
    • 91

    Chance Thunderstorms

    • 77
    • 91

    Slight Chance Thunderstorms

    • 77
    • 88

    Chance Thunderstorms

    • 76
    • 85

    Partly Sunny

    • 75
    • 85

    Chance Thunderstorms

    • 75
    • 86

    Chance Thunderstorms

    • 75
    • 87

    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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Mill Cove - New Castle Island Temperature Statistics

September Temperature

Jacksonville Craig Municipal Airport (5 miles)

  • Lowest 11 September, 2026

    73.9 °F

  • Average September

    82.8 °F

  • Highest 6 September, 2026

    92.6 °F

Climate (2021–2026)

Jacksonville Craig Municipal Airport (5 miles)

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  • Average Low 2021–2026

    62.4 °F

  • Average 2021–2026

    71.2 °F

  • Average High 2021–2026

    80.7 °F
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