Mark Twain Lake Weather Forecast

    • 77
    • 87

    Slight Chance Thunderstorms

    • 70
    • 85

    Chance Thunderstorms

    • 69
    • 81

    Partly Sunny

    • 73
    • 85

    Slight Chance Thunderstorms

    • 68
    • 82

    Chance Thunderstorms

    • 67
    • 78

    Mostly Cloudy

Today 15 Aug Monroe

Mostly cloudy. Near steady temperature in the upper 80s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Heat index Values up to 100.

Tonight 15 Aug Monroe

Mostly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Humid with Lows in the lower 70s. South Winds around 5 Mph, becoming west after midnight. Chance of rain 40 percent. Heat index Values up to 102 early in the evening.

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Mark Twain Lake Temperature Statistics

August Temperature

Quincy Regional Airport-Baldwin Field (42.9 miles)

  • Lowest 3 August, 2026

    61.6 °F

  • Average August

    76.6 °F

  • Highest 11 August, 2026

    92.6 °F

Climate (2021–2026)

Quincy Regional Airport-Baldwin Field (42.9 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    55.6 °F

  • Average High 2021–2026

    65.5 °F
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