Ballwin Weather Forecast

    • 71
    • 97

    Hot

    • 71
    • 97

    Slight Chance Thunderstorms

    • 70
    • 95

    Slight Chance Thunderstorms

    • 69
    • 94

    Slight Chance Thunderstorms

    • 68
    • 93

    Slight Chance Thunderstorms

    • 65
    • 88

    Slight Chance Thunderstorms

Today 13 Sep St. Louis

Mostly sunny. Hot with Highs in the upper 90s. Southwest Winds around 5 Mph.

Tonight 13 Sep St. Louis

Partly cloudy. Lows around 70. South Winds around 5 Mph.

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Ballwin Temperature Statistics

September Temperature

St. Louis, Spirit Of St. Louis Airport (6.8 miles)

  • Lowest 8 September, 2025

    41 °F

  • Average September

    66.3 °F

  • Highest 11 September, 2025

    90 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (6.8 miles)

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    56.9 °F

  • Average High 2020–2025

    68.1 °F
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