Byrnes Mill Weather Forecast

    • 31
    • 54

    Chance Rain Showers

    • 41
    • 57

    Partly Sunny

    • 57
    • 71

    Partly Sunny

    • 64
    • 86

    Slight Chance Thunderstorms

    • 59
    • 88

    Chance Thunderstorms

    • 56
    • 80

    Rain Likely

Today 27 Mar Jefferson

Cloudy with a chance of Showers with a slight chance of Thunderstorms this Morning, then partly sunny this afternoon. Much cooler with Highs in the lower 50s. North Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

Tonight 27 Mar Jefferson

Mostly clear. Cooler with Lows around 30. North Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight.

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  • Temperature Real-Time

Byrnes Mill Temperature Statistics

March Temperature

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

  • Lowest 17 March, 2026

    16.6 °F

  • Average March

    52.4 °F

  • Highest 22 March, 2026

    91.9 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    57.2 °F

  • Average High 2021–2026

    68.6 °F
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