St. Charles Airport Weather Forecast

    • 68
    • 87

    Increasing Clouds

    • 63
    • 86

    Mostly Sunny

    • 63
    • 83

    Partly Sunny

    • 65
    • 81

    Chance Thunderstorms

    • 68
    • 85

    Mostly Cloudy

    • 66
    • 87

    Partly Sunny

Today 21 Aug St. Charles

Sunny. Highs in the mid 80s. East Winds around 5 Mph, becoming west around 5 Mph this afternoon.

Tonight 21 Aug St. Charles

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 60s. Southwest Winds around 5 Mph.

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St. Charles Airport Temperature Statistics

August Temperature

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

  • Lowest 18 August, 2026

    62.1 °F

  • Average August

    79.3 °F

  • Highest 13 August, 2026

    97.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    69 °F
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