Marais Temps Clair Conservation Area Weather Forecast

    • 59
    • 87

    Partly Sunny

    • 54
    • 79

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 52
    • 75

    Mostly Sunny

    • 57
    • 78

    Mostly Sunny

    • 59
    • 79

    Partly Sunny

Today 23 Aug St. Charles

Mostly cloudy. Highs in the mid 80s. Northwest Winds 5 to 10 Mph.

Tonight 23 Aug St. Charles

Partly cloudy in the Evening, then clearing. Lows in the upper 50s. North Winds 5 to 10 Mph.

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Marais Temps Clair Conservation Area Temperature Statistics

August Temperature

St. Charles, St. Charles County Smartt Airport (1.9 miles)

  • Lowest 3 August, 2025

    58.6 °F

  • Average August

    79.2 °F

  • Highest 18 August, 2025

    98.7 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (1.9 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.7 °F

  • Average High 2020–2025

    68.4 °F
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