St Charles Weather Forecast

    • 64
    • 91

    Chance Rain Showers

    • 59
    • 78

    Rain Showers Likely

    • 63
    • 85

    Mostly Sunny

    • 58
    • 83

    Rain Showers Likely

    • 56
    • 75

    Chance Thunderstorms

    • 54
    • 75

    Slight Chance Thunderstorms

Today 13 Sep Gregory

Partly sunny. Highs around 90. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 13 Sep Gregory

Mostly cloudy with a slight chance of Thunderstorms. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows in the mid 60s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming south 5 to 10 Mph after midnight. Chance of rain 40 percent.

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St Charles Temperature Statistics

September Temperature

Winner, Bob Wiley Field Airport (42.9 miles)

  • Lowest 6 September, 2025

    39.9 °F

  • Average September

    65.9 °F

  • Highest 8 September, 2025

    91.9 °F

Climate (2020–Present)

Winner, Bob Wiley Field Airport (42.9 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    63.3 °F
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