St. Charles Airport Weather Forecast

    • 53
    • 77

    Sunny

    • 57
    • 83

    Chance Rain Showers

    • 50
    • 78

    Sunny

    • 57
    • 77

    Chance Rain Showers

    • 66
    • 85

    Chance Rain Showers

    • 67
    • 88

    Slight Chance Thunderstorms

Today 11 May St. Charles

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 11 May St. Charles

Mostly clear. Lows in the lower 50s. North Winds around 5 Mph, becoming southeast after midnight.

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St. Charles Airport Temperature Statistics

May Temperature

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

  • Lowest 3 May, 2026

    40.6 °F

  • Average May

    58.1 °F

  • Highest 4 May, 2026

    81.6 °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

    58 °F

  • Average High 2021–2026

    68.9 °F
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