Piasa Weather Forecast

    • 65
    • 91

    Chance Thunderstorms

    • 58
    • 80

    Partly Sunny

    • 60
    • 79

    Partly Sunny

    • 62
    • 78

    Slight Chance Thunderstorms

    • 66
    • 85

    Mostly Sunny

    • 71
    • 92

    Mostly Sunny

Today 21 Jul Macoupin

Partly sunny with a chance of Showers and Thunderstorms this Morning, then sunny this afternoon. Highs in the lower 90s. Northwest Winds 10 to 15 Mph. Chance of rain 50 percent. Heat index Values up to 100.

Tonight 21 Jul Macoupin

Mostly clear. Cooler with Lows in the mid 60s. North Winds 10 to 15 Mph.

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Piasa Temperature Statistics

July Temperature

St. Louis Regional Airport (16.2 miles)

  • Lowest 14 July, 2026

    66.4 °F

  • Average July

    77.4 °F

  • Highest 2 July, 2026

    93.2 °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

    66.7 °F
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