Byrnes Mill Weather Forecast

    • 70
    • 94

    Thunderstorms Likely

    • 65
    • 85

    Partly Sunny

    • 70
    • 89

    Chance Thunderstorms

    • 67
    • 88

    Chance Thunderstorms

    • 63
    • 82

    Chance Rain Showers

    • 63
    • 84

    Partly Sunny

    • 63
    • 86

    Mostly Sunny

Today 16 Aug Jefferson

Mostly sunny. Hot. Near steady temperature in the lower 90s. West Winds around 5 Mph. Heat index Values up to 114.

Tonight 16 Aug Jefferson

Mostly cloudy. Showers and Thunderstorms Likely, mainly this evening. Lows around 70. North Winds around 5 Mph. Chance of rain 70 percent. Heat index Values up to 108 early this evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Byrnes Mill Temperature Statistics

August Temperature

St. Louis, Spirit Of St. Louis Airport (15.5 miles)

  • Lowest 3 August, 2026

    62.7 °F

  • Average August

    79.5 °F

  • Highest 11 August, 2026

    95.6 °F

Climate (2021–2026)

St. Louis, Spirit Of St. Louis Airport (15.5 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    68.9 °F
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