O'Fallon Weather Forecast

    • 39
    • 53

    Clearing Late

    • 37
    • 59

    Sunny

    • 41
    • 66

    Mostly Sunny

    • 43
    • 71

    Partly Sunny

    • 47
    • 75

    Mostly Sunny

    • 50
    • 78

    Mostly Sunny

Today 16 Oct St. Charles

Partly sunny this Morning, then mostly cloudy with a slight chance of Showers this afternoon. Much cooler. Near steady temperature in the lower 50s. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

Tonight 16 Oct St. Charles

Mostly cloudy in the Evening, then becoming partly cloudy. Cooler with Lows in the upper 30s. North Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

O'Fallon Temperature Statistics

October Temperature

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

  • Lowest 6 October, 2026

    42.7 °F

  • Average October

    68 °F

  • Highest 12 October, 2026

    92.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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