O'Fallon Weather Forecast

    • 64
    • 82

    Partly Sunny

    • 66
    • 79

    Chance Thunderstorms

    • 62
    • 73

    Rain Showers Likely

    • 62
    • 79

    Chance Rain Showers

    • 63
    • 82

    Mostly Sunny

    • 65
    • 84

    Slight Chance Thunderstorms

    • 64
    • 83

    Chance Thunderstorms

Today 14 Aug St. Charles

Partly sunny. Near steady temperature in the lower 80s. Northwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

O'Fallon Temperature Statistics

August Temperature

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

  • Lowest 11 August, 2022

    59 °F
  • Average August

    79 °F
  • Highest 3 August, 2022

    96.1 °F

Climate (2010–Present)

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

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  • Average Low 2010–Present

    47.3 °F
  • Average 2010–Present

    57 °F
  • Average High 2010–Present

    67.5 °F
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