St. Charles County Smartt Airport Weather Forecast

    • 77
    • 97

    Hot

    • 77
    • 98

    Hot

    • 77
    • 98

    Hot

    • 77
    • 98

    Slight Chance Thunderstorms

    • 76
    • 96

    Slight Chance Thunderstorms

    • 75
    • 96

    Slight Chance Thunderstorms

Today 29 Jun St. Charles

Mostly sunny. Hot with Highs in the mid 90s. South Winds 10 to 15 Mph. Heat index Values up to 110.

Tonight 29 Jun St. Charles

Partly cloudy in the Evening, then clearing. Humid with Lows in the mid 70s. South Winds 10 to 15 Mph. Heat index Values up to 109 early in the evening.

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St. Charles County Smartt Airport Temperature Statistics

June Temperature

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

  • Lowest 16 June, 2026

    55.7 °F

  • Average June

    74.6 °F

  • Highest 17 June, 2026

    93.7 °F

Climate (2021–2026)

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