Saint Charles Weather Forecast

    • 45
    • 55

    Decreasing Clouds

    • 43
    • 62

    Mostly Cloudy

    • 55
    • 67

    Mostly Cloudy

    • 60
    • 70

    Mostly Cloudy

    • 49
    • 70

    Partly Sunny

    • 37
    • 71

    Mostly Cloudy

    • 23
    • 45

    Partly Sunny

Today 22 Dec St. Charles

Mostly cloudy. Not as cool with Highs in the mid 50s. South Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 22 Dec St. Charles

Partly cloudy and not as cool. Near steady temperature in the mid 40s. South Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Charles Temperature Statistics

December Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    32.5 °F

  • Highest 16 December, 2025

    57 °F

Climate (2020–Present)

St. Louis Lambert International Airport (6.2 miles)

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

  • Average Low 2020–2025

    50.5 °F

  • Average 2020–2025

    59.8 °F

  • Average High 2020–2025

    69.1 °F
Get WillyWeather+ to remove ads