Weldon Spring Weather Forecast

    • 61
    • 92

    Mostly Sunny

    • 62
    • 91

    Mostly Sunny

    • 66
    • 93

    Partly Sunny

    • 63
    • 83

    Chance Thunderstorms

    • 64
    • 83

    Chance Thunderstorms

    • 65
    • 85

    Chance Rain Showers

Today 16 Sep St. Charles

Sunny. Near steady temperature in the lower 90s. Northeast Winds around 5 Mph with Gusts up to 20 Mph.

Tonight 16 Sep St. Charles

Mostly clear. Lows in the lower 60s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Weldon Spring Temperature Statistics

September Temperature

St. Louis, Spirit Of St. Louis Airport (3.7 miles)

  • Lowest 8 September, 2025

    41 °F

  • Average September

    69.3 °F

  • Highest 14 September, 2025

    98.1 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (3.7 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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