St. Charles Airport Weather Forecast

    • 74
    • 87

    Isolated Thunderstorms

    • 78
    • 93

    Slight Chance Thunderstorms

    • 78
    • 97

    Hot

    • 76
    • 98

    Hot

    • 75
    • 93

    Chance Thunderstorms

    • 76
    • 94

    Chance Thunderstorms

    • 75
    • 95

    Mostly Sunny

Today 21 Jul St. Charles

Partly sunny. Near steady temperature in the mid 80s. East Winds around 5 Mph.

Tonight 21 Jul St. Charles

Partly cloudy. A slight chance of Showers and Thunderstorms. Lows in the lower 70s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St. Charles Airport Temperature Statistics

July Temperature

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