Matanzas River - San Sebastian River Entrance Weather Forecast

    • 72
    • 87

    Slight Chance Thunderstorms

    • 77
    • 86

    Slight Chance Thunderstorms

    • 77
    • 83

    Chance Thunderstorms

    • 78
    • 82

    Chance Thunderstorms

    • 76
    • 83

    Chance Thunderstorms

    • 77
    • 85

    Chance Thunderstorms

Today 18 Sep Southeast Coastal St. Johns

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. Northeast Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 18 Sep Southeast Coastal St. Johns

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the lower 70s. East Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight.

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Matanzas River - San Sebastian River Entrance Temperature Statistics

September Temperature

Northeast Florida Regional Airport (6.2 miles)

  • Lowest 15 September, 2025

    66 °F

  • Average September

    79.8 °F

  • Highest 7 September, 2025

    91 °F

Climate (2020–Present)

Northeast Florida Regional Airport (6.2 miles)

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  • Average Low 2020–2025

    63.8 °F

  • Average 2020–2025

    70.8 °F

  • Average High 2020–2025

    78 °F
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