Mount Pleasant Weather Forecast

    • 78
    • 96

    Mostly Sunny

    • 77
    • 100

    Hot

    • 73
    • 98

    Chance Thunderstorms

    • 70
    • 88

    Slight Chance Thunderstorms

    • 74
    • 91

    Mostly Sunny

    • 72
    • 96

    Chance Rain Showers

    • 69
    • 86

    Slight Chance Thunderstorms

Today 14 Aug St. Louis City

Mostly sunny with a slight chance of Showers and Thunderstorms. Hot. Near steady temperature in the mid 90s. South Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 108.

Tonight 14 Aug St. Louis City

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the mid 70s. South Winds around 5 Mph. Heat index Values up to 107 early in the evening.

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Mount Pleasant Temperature Statistics

August Temperature

St. Louis Downtown Airport (4.3 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    78.9 °F

  • Highest 11 August, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (4.3 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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