Saint Charles Weather Forecast

    • 71
    • 77

    Chance Thunderstorms

    • 73
    • 89

    Chance Thunderstorms

    • 74
    • 91

    Slight Chance Thunderstorms

    • 77
    • 93

    Partly Sunny

    • 77
    • 94

    Slight Chance Thunderstorms

    • 76
    • 93

    Chance Thunderstorms

    • 73
    • 89

    Chance Thunderstorms

Today 6 Aug St. Charles

Showers and Thunderstorms likely. Cooler with Highs in the upper 70s. South Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 6 Aug St. Charles

Mostly cloudy with a chance of Showers and Thunderstorms. Lows around 70. Southeast Winds around 5 Mph. Chance of rain 40 percent.

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Saint Charles Temperature Statistics

August Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 3 August, 2026

    66.9 °F

  • Average August

    76 °F

  • Highest 4 August, 2026

    88 °F

Climate (2021–2026)

St. Louis Lambert International Airport (6.2 miles)

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  • Average Low 2021–2026

    50.6 °F

  • Average 2021–2026

    60.1 °F

  • Average High 2021–2026

    69.7 °F
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