South Shore Weather Forecast

    • 65
    • 94

    Partly Sunny

    • 65
    • 93

    Mostly Sunny

    • 65
    • 93

    Partly Sunny

    • 66
    • 91

    Chance Thunderstorms

    • 63
    • 86

    Chance Thunderstorms

    • 62
    • 83

    Chance Thunderstorms

Today 15 Sep St. Charles

Mostly sunny. Highs in the lower 90s. East Winds 5 to 10 Mph.

Tonight 15 Sep St. Charles

Partly cloudy in the Evening, then becoming mostly clear. Lows in the mid 60s. East Winds 5 to 10 Mph.

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South Shore Temperature Statistics

September Temperature

St. Charles, St. Charles County Smartt Airport (6.2 miles)

  • Lowest 7 September, 2025

    48 °F

  • Average September

    67.5 °F

  • Highest 12 September, 2025

    91.9 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (6.2 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.6 °F

  • Average High 2020–2025

    68.3 °F
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