Barnhart Weather Forecast

    • 77
    • 98

    Hot

    • 76
    • 99

    Slight Chance Thunderstorms

    • 75
    • 97

    Slight Chance Thunderstorms

    • 75
    • 95

    Partly Sunny

    • 76
    • 99

    Hot

    • 74
    • 99

    Hot

Today 11 Aug Jefferson

Mostly sunny. Hot with Highs in the upper 90s. Southwest Winds 5 to 10 Mph. Heat index Values up to 108.

Tonight 11 Aug Jefferson

Partly cloudy in the Evening, then becoming mostly clear. Lows in the upper 70s. Southwest Winds around 5 Mph. Heat index Values up to 106 early in the evening.

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Barnhart Temperature Statistics

August Temperature

St. Louis Downtown Airport (19.9 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    76.4 °F

  • Highest 7 August, 2026

    91.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (19.9 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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