Marais Temps Clair Conservation Area Weather Forecast

    • 59
    • 92

    Isolated Thunderstorms

    • 56
    • 87

    Thunderstorms

    • 57
    • 79

    Partly Sunny

    • 61
    • 80

    Rain Showers Likely

    • 65
    • 79

    Rain Showers Likely

    • 62
    • 82

    Rain Showers

Today 15 May St. Charles

Sunny late this Morning, then mostly cloudy with isolated Showers and Thunderstorms this afternoon. Highs in the lower 90s. South Winds 15 to 20 Mph. Chance of rain 20 percent.

Tonight 15 May St. Charles

Partly cloudy with isolated Showers and Thunderstorms in the Evening, then mostly clear after midnight. Less humid with Lows in the lower 60s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight. Chance of rain 20 percent.

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Marais Temps Clair Conservation Area Temperature Statistics

May Temperature

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

  • Lowest 6 May, 2025

    43.6 °F

  • Average May

    61.9 °F

  • Highest 11 May, 2025

    80.7 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.6 °F

  • Average High 2020–2025

    68.4 °F
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