Nassau River - Mesa Marsh Weather Forecast

    • 75
    • 86

    Chance Rain Showers

    • 77
    • 83

    Chance Rain Showers

    • 77
    • 83

    Rain Showers Likely

    • 75
    • 80

    Chance Thunderstorms

    • 73
    • 77

    Slight Chance Rain Showers

    • 73
    • 77

    Partly Sunny

Today 21 Sep Coastal Nassau

Partly sunny this Morning, then becoming mostly cloudy. A chance of Showers with a slight chance of Thunderstorms. Highs in the upper 80s. North Winds 5 to 10 Mph, becoming northeast 10 to 15 Mph this afternoon. Chance of rain 40 percent.

Tonight 21 Sep Coastal Nassau

Mostly cloudy in the Evening, then becoming partly cloudy. A slight chance of Thunderstorms in the evening. A slight chance of Showers. Lows in the mid 70s. East Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming south after midnight. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Nassau River - Mesa Marsh Temperature Statistics

September Temperature

Fernandina Beach Municipal Airport (5 miles)

  • Lowest 12 September, 2026

    71.6 °F

  • Average September

    81.6 °F

  • Highest 13 September, 2026

    91.4 °F

Climate (2021–2026)

Fernandina Beach Municipal Airport (5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    62.8 °F

  • Average 2021–2026

    70.1 °F

  • Average High 2021–2026

    78.3 °F
Get WillyWeather+ to remove ads