Byrnes Mill Weather Forecast

    • 76
    • 97

    Hot

    • 77
    • 97

    Hot

    • 76
    • 96

    Mostly Sunny

    • 75
    • 95

    Slight Chance Thunderstorms

    • 75
    • 95

    Chance Rain Showers

    • 73
    • 93

    Chance Thunderstorms

Today 30 Jun Jefferson

Sunny, hot with Highs in the upper 90s. Southwest Winds around 5 Mph. Heat index Values up to 109.

Tonight 30 Jun Jefferson

Clear with Lows in the mid 70s. South Winds around 5 Mph. Heat index Values up to 110 early in the evening.

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Byrnes Mill Temperature Statistics

June Temperature

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

  • Lowest 3 June, 2026

    52.6 °F

  • Average June

    74.3 °F

  • Highest 9 June, 2026

    93.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    68.8 °F
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