St Charles Weather Forecast

    • 54
    • 72

    Increasing Clouds

    • 56
    • 65

    Rain Showers Likely

    • 52
    • 78

    Rain Showers Likely

    • 51
    • 63

    Mostly Cloudy

    • 52
    • 66

    Mostly Cloudy

    • 53
    • 66

    Slight Chance Rain Showers

Today 12 Sep Gregory

Mostly sunny. Not as warm with Highs in the lower 70s. North Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 12 Sep Gregory

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the lower 50s. East Winds 5 to 10 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Charles Temperature Statistics

September Temperature

Winner, Bob Wiley Field Airport (42.9 miles)

  • Lowest 9 September, 2026

    54 °F

  • Average September

    76.8 °F

  • Highest 3 September, 2026

    100.9 °F

Climate (2021–2026)

Winner, Bob Wiley Field Airport (42.9 miles)

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  • Average Low 2021–2026

    39.6 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    63.5 °F
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