St. Charles Airport Weather Forecast

    • 69
    • 85

    Partly Sunny

    • 68
    • 87

    Partly Sunny

    • 72
    • 90

    Mostly Sunny

    • 74
    • 93

    Thunderstorms Likely

    • 72
    • 90

    Thunderstorms Likely

    • 71
    • 89

    Slight Chance Thunderstorms

Today 6 Jul St. Charles

Mostly sunny. A slight chance of Showers and Thunderstorms. Highs in the mid 80s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 6 Jul St. Charles

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 60s. North Winds 5 to 10 Mph.

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St. Charles Airport Temperature Statistics

July Temperature

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

  • Lowest 4 July, 2026

    72 °F

  • Average July

    83.7 °F

  • Highest 2 July, 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

    47.3 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.9 °F
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