St Charles Weather Forecast

    • 51
    • 72

    Sunny

    • 54
    • 77

    Mostly Sunny

    • 60
    • 81

    Mostly Sunny

    • 64
    • 88

    Mostly Sunny

    • 67
    • 90

    Mostly Sunny

    • 68
    • 91

    Mostly Sunny

Today 7 Sep St. Charles

Sunny. Highs in the mid 70s. North Winds 5 to 10 Mph.

Tonight 7 Sep St. Charles

Clear. Lows in the upper 40s. Northeast Winds around 5 Mph in the Evening, becoming light and variable.

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St Charles Temperature Statistics

September Temperature

St. Louis Lambert International Airport (7.5 miles)

  • Lowest 4 September, 2025

    59 °F

  • Average September

    70 °F

  • Highest 3 September, 2025

    84.9 °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

    59.7 °F

  • Average High 2020–2025

    69.1 °F
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