St. Charles Airport Weather Forecast

    • 45
    • 63

    Mostly Cloudy

    • 64
    • 79

    Partly Sunny

    • 43
    • 91

    Mostly Cloudy

    • 31
    • 53

    Slight Chance Rain

    • 40
    • 58

    Partly Sunny

    • 47
    • 65

    Partly Sunny

Today 24 Mar St. Charles

Mostly sunny. Highs in the lower 60s. Southeast Winds 5 to 10 Mph.

Tonight 24 Mar St. Charles

Mostly cloudy. Lows in the mid 40s. Southeast Winds 5 to 10 Mph.

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St. Charles Airport Temperature Statistics

March Temperature

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

  • Lowest 17 March, 2026

    14.6 °F

  • Average March

    51.6 °F

  • Highest 20 March, 2026

    89.7 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    68.7 °F
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