Mount Pleasant Weather Forecast

    • 32
    • 39

    Mostly Sunny

    • 30
    • 55

    Partly Sunny

    • 30
    • 43

    Partly Sunny

    • 42
    • 48

    Mostly Cloudy

    • 49
    • 62

    Mostly Cloudy

    • 57
    • 67

    Mostly Cloudy

Today 19 Dec St. Louis City

Sunny. Much cooler with Highs in the upper 30s. West Winds around 10 Mph with Gusts up to 20 Mph, becoming southwest.

Tonight 19 Dec St. Louis City

Mostly clear in the Evening, then becoming partly cloudy. Near steady temperature in the mid 30s. Temperature rising into the mid 30s after midnight. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Mount Pleasant Temperature Statistics

December Temperature

St. Louis Downtown Airport (4.3 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    30.9 °F

  • Highest 17 December, 2025

    57 °F

Climate (2020–Present)

St. Louis Downtown Airport (4.3 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.6 °F
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