O'Fallon Weather Forecast

    • 53
    • 80

    Rain Showers

    • 45
    • 61

    Rain Showers

    • 42
    • 58

    Chance Rain Showers

    • 46
    • 64

    Mostly Sunny

    • 49
    • 71

    Chance Rain Showers

    • 52
    • 74

    Chance Rain Showers

Today 4 May St. Charles

Partly sunny with a chance of Showers and Thunderstorms. Highs around 80. Southwest Winds 15 to 20 Mph. Chance of rain 30 percent.

Tonight 4 May St. Charles

Mostly cloudy with Showers likely with a chance of Thunderstorms. Lows in the mid 50s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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O'Fallon Temperature Statistics

May Temperature

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

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Climate (2021–Present)

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

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    57.3 °F

  • Average High 2021–2026

    68.8 °F
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