Byrnes Mill Weather Forecast

    • 75
    • 96

    Chance Thunderstorms

    • 74
    • 93

    Chance Rain Showers

    • 76
    • 97

    Hot

    • 76
    • 98

    Hot

    • 76
    • 97

    Hot

    • 75
    • 96

    Slight Chance Thunderstorms

    • 75
    • 95

    Chance Thunderstorms

Today 20 Jul Jefferson

Mostly sunny. Hot. Near steady temperature in the mid 90s. Southwest Winds 5 to 10 Mph. Heat index Values up to 109.

Tonight 20 Jul Jefferson

Mostly cloudy. A chance of Showers and Thunderstorms early this Evening, then Showers and Thunderstorms likely. Lows in the mid 70s. South Winds around 5 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Byrnes Mill Temperature Statistics

July Temperature

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

  • Lowest 2 July, 2025

    62.7 °F

  • Average July

    80 °F

  • Highest 16 July, 2025

    95.6 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    56.8 °F

  • Average High 2020–2025

    68 °F
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