Weldon Spring Weather Forecast

    • 68
    • 83

    Increasing Clouds

    • 72
    • 88

    Mostly Cloudy

    • 64
    • 85

    Rain Showers Likely

    • 57
    • 72

    Chance Rain Showers

    • 57
    • 68

    Chance Rain Showers

    • 52
    • 70

    Mostly Sunny

Today 29 Sep St. Charles

Mostly sunny. Highs in the mid 80s. South Winds 5 to 10 Mph.

Tonight 29 Sep St. Charles

Mostly cloudy. Not as cool with Lows in the upper 60s. Southeast 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 25 September, 2026

    53.7 °F

  • Average September

    77.6 °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

    46.2 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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