Mount Pleasant Weather Forecast

    • 80
    • 100

    Hot

    • 78
    • 101

    Hot

    • 68
    • 94

    Mostly Sunny

    • 68
    • 92

    Mostly Sunny

    • 75
    • 98

    Hot

    • 76
    • 101

    Slight Chance Thunderstorms

    • 70
    • 93

    Slight Chance Thunderstorms

Today 4 Sep St. Louis City

Sunny, hot. Near steady temperature in the upper 90s. Southwest Winds around 5 Mph. Heat index Values up to 106.

Tonight 4 Sep St. Louis City

Mostly clear. Lows in the upper 70s. Southwest Winds around 5 Mph this Evening, becoming light and variable. Heat index Values up to 106 early this evening.

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Mount Pleasant Temperature Statistics

September Temperature

St. Louis Downtown Airport (4.3 miles)

  • Lowest 1 September, 2026

    70.6 °F

  • Average September

    86.2 °F

  • Highest 1 September, 2026

    100.7 °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

    58.6 °F

  • Average High 2021–2026

    69.4 °F
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