St. Louis Weather Forecast

    • 73
    • 95

    Rain Showers

    • 68
    • 82

    Rain Showers

    • 70
    • 86

    Partly Sunny

    • 71
    • 91

    Chance Rain Showers

    • 72
    • 91

    Partly Sunny

    • 72
    • 94

    Chance Rain Showers

Today 9 Sep St. Louis City

Mostly sunny. A slight chance of Showers late this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the mid 90s. West Winds 5 to 10 Mph. Chance of rain 50 percent. Heat index Values up to 102.

Tonight 9 Sep St. Louis City

Thunderstorms likely. Showers with Lows in the lower 70s. Northwest Winds around 5 Mph. Chance of rain near 100 percent.

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St. Louis Temperature Statistics

September Temperature

St. Louis Downtown Airport (5 miles)

  • Lowest 7 September, 2026

    63 °F

  • Average September

    84.8 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (5 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    69.4 °F
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