Saint Charles Weather Forecast

    • 62
    • 82

    Mostly Sunny

    • 62
    • 83

    Mostly Sunny

    • 63
    • 83

    Mostly Sunny

    • 68
    • 87

    Partly Sunny

    • 72
    • 89

    Mostly Sunny

    • 76
    • 94

    Slight Chance Thunderstorms

    • 78
    • 97

    Slight Chance Thunderstorms

Today 2 Aug St. Charles

Mostly sunny. Chance of Sprinkles. High near 80. Light wind in the morning becoming northeast around 10 Mph in the afternoon.

Tonight 2 Aug St. Charles

Mostly clear. Low in the mid 50s to lower 60s. Northeast wind around 10 Mph in the evening becoming light after midnight.

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Saint Charles Temperature Statistics

August Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest

  • Average August

  • Highest

Climate (2010–Present)

St. Louis Lambert International Airport (6.2 miles)

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  • Average Low 2010–Present

    49.3 °F
  • Average 2010–Present

    57.6 °F
  • Average High 2010–Present

    66.4 °F
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