Piasa Weather Forecast

    • 75
    • 95

    Isolated Thunderstorms

    • 74
    • 96

    Slight Chance Thunderstorms

    • 75
    • 95

    Slight Chance Thunderstorms

    • 71
    • 92

    Chance Thunderstorms

    • 65
    • 81

    Partly Sunny

    • 64
    • 82

    Mostly Sunny

    • 65
    • 84

    Mostly Sunny

Today 16 Aug Macoupin

Sunny. Highs in the mid 90s. South Winds around 5 Mph. Heat index Values up to 104.

Tonight 16 Aug Macoupin

Mostly cloudy with a slight chance of Showers and Thunderstorms this Evening, then mostly clear after midnight. Lows in the mid 70s. South Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Piasa Temperature Statistics

August Temperature

St. Louis Regional Airport (16.2 miles)

  • Lowest 3 August, 2025

    56.7 °F

  • Average August

    73.4 °F

  • Highest 8 August, 2025

    91.4 °F

Climate (2020–Present)

St. Louis Regional Airport (16.2 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    53.9 °F

  • Average High 2020–2025

    66 °F
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