Weldon Spring Weather Forecast

    • 72
    • 96

    Increasing Clouds

    • 66
    • 90

    Rain Showers Likely

    • 59
    • 78

    Rain Showers Likely

    • 54
    • 70

    Mostly Cloudy

    • 54
    • 72

    Partly Sunny

    • 58
    • 74

    Mostly Cloudy

    • 59
    • 77

    Slight Chance Rain Showers

Today 19 Sep St. Charles

Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Tonight 19 Sep St. Charles

Partly cloudy. Lows in the lower 70s. Southwest 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, 2026

    59.6 °F

  • Average September

    81.5 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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