Mount Pleasant Weather Forecast

    • 69
    • 84

    Gradual Clearing

    • 70
    • 91

    Partly Sunny

    • 67
    • 90

    Slight Chance Thunderstorms

    • 70
    • 90

    Mostly Sunny

    • 72
    • 96

    Partly Sunny

    • 72
    • 94

    Chance Rain Showers

    • 69
    • 89

    Chance Thunderstorms

Today 11 Sep St. Louis City

Cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the lower 80s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 11 Sep St. Louis City

Mostly cloudy with a slight chance of Showers and Thunderstorms this Evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the upper 60s. South Winds around 5 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Pleasant Temperature Statistics

September Temperature

St. Louis Downtown Airport (4.3 miles)

  • Lowest 8 September, 2026

    59.6 °F

  • Average September

    83.6 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    69.4 °F
Get WillyWeather+ to remove ads