Herculaneum Weather Forecast

    • 67
    • 87

    Mostly Sunny

    • 63
    • 86

    Mostly Sunny

    • 61
    • 82

    Partly Sunny

    • 63
    • 80

    Chance Thunderstorms

    • 66
    • 84

    Slight Chance Thunderstorms

    • 65
    • 87

    Partly Sunny

Today 21 Aug Jefferson

Sunny. Highs in the mid 80s. Light and variable Winds, becoming west around 5 Mph this afternoon.

Tonight 21 Aug Jefferson

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 60s. Southwest Winds around 5 Mph.

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Herculaneum Temperature Statistics

August Temperature

St. Louis Downtown Airport (23.6 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    80 °F

  • Highest 11 August, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (23.6 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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