Lambert - St. Louis International Airport Weather Forecast

    • 27
    • 55

    Decreasing Clouds

    • 31
    • 42

    Decreasing Clouds

    • 45
    • 52

    Partly Sunny

    • 43
    • 62

    Partly Sunny

    • 56
    • 66

    Mostly Cloudy

    • 52
    • 72

    Partly Sunny

    • 44
    • 65

    Mostly Cloudy

Today 20 Dec St. Louis

Mostly sunny. Not as cool with Highs in the mid 50s. Temperature falling into the upper 40s late. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 20 Dec St. Louis

Partly cloudy. Lows in the upper 20s. North Winds 5 to 10 Mph.

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Lambert - St. Louis International Airport Temperature Statistics

December Temperature

St. Louis Lambert International Airport (0 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    32.1 °F

  • Highest 16 December, 2025

    57 °F

Climate (2020–Present)

St. Louis Lambert International Airport (0 miles)

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  • Average Low 2020–2025

    50.5 °F

  • Average 2020–2025

    59.8 °F

  • Average High 2020–2025

    69.1 °F
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