Marietta Weather Forecast

    • 59
    • 81

    Mostly Cloudy

    • 64
    • 83

    Chance Thunderstorms

    • 62
    • 86

    Mostly Sunny

    • 56
    • 81

    Mostly Sunny

    • 56
    • 81

    Mostly Sunny

    • 60
    • 82

    Chance Rain Showers

    • 62
    • 83

    Chance Rain Showers

Today 23 Aug Lac Qui Parle

Sunny. Highs in the lower 80s. Southeast Winds 5 to 10 Mph.

Tonight 23 Aug Lac Qui Parle

Warmer. Increasing Clouds. Lows around 60. Southeast Winds 5 to 10 Mph.

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Marietta Temperature Statistics

August Temperature

Madison, Madison-Lac Qui Parle County Airport (11.8 miles)

  • Lowest 5 August, 2026

    47.5 °F

  • Average August

    69.6 °F

  • Highest 20 August, 2026

    86.9 °F

Climate (2021–2026)

Madison, Madison-Lac Qui Parle County Airport (11.8 miles)

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  • Average Low 2021–2026

    37 °F

  • Average 2021–2026

    47.5 °F

  • Average High 2021–2026

    58 °F
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