O'Fallon Weather Forecast

    • 61
    • 72

    Rain Likely

    • 65
    • 78

    Thunderstorms Likely

    • 60
    • 83

    Thunderstorms Likely

    • 59
    • 82

    Thunderstorms Likely

    • 53
    • 77

    Slight Chance Rain Showers

    • 49
    • 69

    Mostly Sunny

Today 5 May St. Charles

Partly sunny in the Morning, then mostly cloudy with a chance of Showers in the afternoon. Cooler with Highs in the lower 70s. North Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 5 May St. Charles

Showers likely. A slight chance of Thunderstorms after midnight. Lows in the lower 60s. East Winds around 5 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

O'Fallon Temperature Statistics

May Temperature

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

  • Lowest 2 May, 2024

    57.9 °F

  • Average May

    69.4 °F

  • Highest 2 May, 2024

    84 °F

Climate (2019–Present)

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

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  • Average Low 2019–2024

    46.2 °F

  • Average 2019–2024

    56.7 °F

  • Average High 2019–2024

    67.7 °F
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