Herculaneum Weather Forecast

    • 68
    • 87

    Mostly Cloudy

    • 68
    • 87

    Slight Chance Thunderstorms

    • 70
    • 90

    Slight Chance Thunderstorms

    • 73
    • 94

    Rain Showers Likely

    • 71
    • 91

    Rain Showers Likely

    • 70
    • 89

    Chance Thunderstorms

    • 70
    • 90

    Mostly Sunny

Today 6 Jul Jefferson

Partly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 80s. North Winds around 5 Mph. Chance of rain 20 percent.

Tonight 6 Jul Jefferson

Mostly cloudy. Lows in the upper 60s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Herculaneum Temperature Statistics

July Temperature

St. Louis Downtown Airport (23.6 miles)

  • Lowest 4 July, 2026

    71.1 °F

  • Average July

    82.9 °F

  • Highest 2 July, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (23.6 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.4 °F

  • Average High 2021–2026

    69.3 °F
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