St Charles Weather Forecast

    • 64
    • 86

    Chance Thunderstorms

    • 64
    • 84

    Chance Thunderstorms

    • 62
    • 83

    Rain Showers Likely

    • 59
    • 77

    Rain Showers

    • 56
    • 72

    Rain Showers

    • 55
    • 71

    Chance Rain Showers

Today 19 Sep Lee

Mostly sunny. Areas of fog this morning. A slight chance of Showers and Thunderstorms early this afternoon. A chance of Showers and Thunderstorms late. Highs in the upper 80s to lower 90s. Light Winds. Chance of rain 30 percent.

Tonight 19 Sep Lee

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the mid 60s. Light Winds. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Charles Temperature Statistics

September Temperature

Lee County Airport (13 miles)

  • Lowest 15 September, 2026

    59 °F

  • Average September

    75.7 °F

  • Highest 2 September, 2026

    95 °F

Climate (2021–2026)

Lee County Airport (13 miles)

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  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    56.6 °F

  • Average High 2021–2026

    69.1 °F
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