St Charles Weather Forecast

    • 78
    • 95

    Slight Chance Thunderstorms

    • 78
    • 97

    Hot

    • 76
    • 97

    Hot

    • 76
    • 93

    Chance Thunderstorms

    • 77
    • 94

    Chance Thunderstorms

    • 76
    • 95

    Mostly Sunny

Today 22 Jul St. Charles

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the lower 90s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 108.

Tonight 22 Jul St. Charles

Partly cloudy with a 20 percent chance of Showers. Near steady temperature in the mid 70s. East Winds around 5 Mph.

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St Charles Temperature Statistics

July Temperature

St. Louis Lambert International Airport (7.5 miles)

  • Lowest 2 July, 2025

    67.6 °F

  • Average July

    81.1 °F

  • Highest 16 July, 2025

    95.6 °F

Climate (2020–Present)

St. Louis Lambert International Airport (7.5 miles)

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  • Average Low 2020–2025

    50.4 °F

  • Average 2020–2025

    59.6 °F

  • Average High 2020–2025

    69 °F
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