Cahokia Weather Forecast

    • 78
    • 98

    Chance Rain Showers

    • 78
    • 99

    Hot

    • 74
    • 99

    Chance Thunderstorms

    • 69
    • 88

    Partly Sunny

    • 73
    • 90

    Mostly Sunny

    • 74
    • 97

    Chance Rain Showers

Today 14 Aug St. Clair

Mostly sunny. A chance of Showers and Thunderstorms this morning. Hot with Highs in the mid 90s. South Winds around 5 Mph. Chance of rain 50 percent. Heat index Values up to 112 this afternoon.

Tonight 14 Aug St. Clair

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the upper 70s. Southeast Winds around 5 Mph. Heat index Values up to 112 early in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cahokia Temperature Statistics

August Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    78.9 °F

  • Highest 11 August, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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