O'Fallon Weather Forecast

    • 44
    • 57

    Increasing Clouds

    • 50
    • 57

    Rain Showers

    • 35
    • 61

    Slight Chance Rain

    • 27
    • 46

    Mostly Sunny

    • 27
    • 45

    Partly Sunny

    • 31
    • 45

    Partly Sunny

Today 23 Nov St. Charles

Patchy fog in the morning. Sunny. Highs in the upper 50s. Northwest Winds around 5 Mph, becoming northeast in the afternoon.

Tonight 23 Nov St. Charles

Partly cloudy. Near steady temperature in the mid 40s. West Winds around 5 Mph.

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O'Fallon Temperature Statistics

November Temperature

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

  • Lowest 10 November, 2025

    21 °F

  • Average November

    51.9 °F

  • Highest 14 November, 2025

    80.1 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57.1 °F

  • Average High 2020–2025

    68.3 °F
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