Piasa Weather Forecast

    • 68
    • 99

    Hot

    • 62
    • 89

    Mostly Sunny

    • 63
    • 87

    Mostly Sunny

    • 72
    • 95

    Mostly Sunny

    • 67
    • 98

    Hot

    • 63
    • 88

    Slight Chance Thunderstorms

Today 5 Sep Macoupin

Sunny, hot with Highs in the upper 90s. Northwest Winds around 5 Mph. Heat index Values up to 108.

Tonight 5 Sep Macoupin

Partly cloudy. Lows in the upper 60s. Northeast Winds around 5 Mph. Heat index Values up to 104 early in the evening.

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Piasa Temperature Statistics

September Temperature

St. Louis Regional Airport (16.2 miles)

  • Lowest 1 September, 2026

    70.2 °F

  • Average September

    81.4 °F

  • Highest 1 September, 2026

    98.6 °F

Climate (2021–2026)

St. Louis Regional Airport (16.2 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    66.6 °F
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