Round Key Weather Forecast

    • 78
    • 85

    Thunderstorms Likely

    • 77
    • 85

    Thunderstorms Likely

    • 76
    • 86

    Chance Thunderstorms

    • 74
    • 87

    Chance Thunderstorms

    • 73
    • 86

    Slight Chance Thunderstorms

    • 73
    • 84

    Chance Thunderstorms

    • 75
    • 84

    Chance Thunderstorms

Today 22 Sep Coastal Collier County

Partly sunny with a chance of Showers. A chance of Thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50 percent.

Tonight 22 Sep Coastal Collier County

Mostly cloudy. Showers and Thunderstorms Likely, mainly this evening. Lows in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Round Key Temperature Statistics

September Temperature

Naples, Naples Municipal Airport (26.1 miles)

  • Lowest 20 September, 2026

    73 °F

  • Average September

    83.3 °F

  • Highest 9 September, 2026

    93.7 °F

Climate (2021–2026)

Naples, Naples Municipal Airport (26.1 miles)

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

  • Average Low 2021–2026

    69.4 °F

  • Average 2021–2026

    77.1 °F

  • Average High 2021–2026

    85.4 °F
Get WillyWeather+ to remove ads