Cahokia Weather Forecast

    • 76
    • 93

    Slight Chance Thunderstorms

    • 77
    • 95

    Slight Chance Thunderstorms

    • 74
    • 94

    Chance Thunderstorms

    • 79
    • 97

    Hot

    • 72
    • 99

    Hot

    • 65
    • 88

    Partly Sunny

    • 68
    • 87

    Partly Sunny

Today 17 Jul St. Clair

Mostly sunny with a chance of Showers and Thunderstorms. Near steady temperature in the upper 80s. West Winds 5 to 10 Mph. Chance of rain 40 percent. Heat index Values up to 103.

Tonight 17 Jul St. Clair

Mostly clear. A slight chance of Showers and Thunderstorms this evening. Lows in the mid 70s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cahokia Temperature Statistics

July Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 14 July, 2026

    66.9 °F

  • Average July

    80.6 °F

  • Highest 2 July, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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