St. Charles County Smartt Airport Weather Forecast

    • 76
    • 92

    Chance Thunderstorms

    • 75
    • 94

    Chance Thunderstorms

    • 75
    • 91

    Chance Rain Showers

    • 77
    • 94

    Mostly Sunny

    • 77
    • 97

    Hot

    • 77
    • 98

    Hot

Today 19 Jul St. Charles

Partly sunny with a chance of Showers and Thunderstorms. Highs in the lower 90s. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent. Heat index Values up to 106 this afternoon.

Tonight 19 Jul St. Charles

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the mid 70s. Southwest Winds around 5 Mph. Heat index Values up to 101 early in the evening.

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St. Charles County Smartt Airport Temperature Statistics

July Temperature

St. Charles, St. Charles County Smartt Airport (0 miles)

  • Lowest 2 July, 2025

    65.6 °F

  • Average July

    80.1 °F

  • Highest 16 July, 2025

    94.6 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (0 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.6 °F

  • Average High 2020–2025

    68.3 °F
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