Marietta Weather Forecast

    • 72
    • 90

    Chance Thunderstorms

    • 65
    • 81

    Rain Showers Likely

    • 64
    • 82

    Mostly Sunny

    • 67
    • 85

    Slight Chance Thunderstorms

    • 70
    • 89

    Slight Chance Thunderstorms

    • 70
    • 90

    Chance Thunderstorms

Today 22 Jul Lac Qui Parle

Mostly sunny. Highs in the lower 90s. South Winds 15 to 20 Mph.

Tonight 22 Jul Lac Qui Parle

Partly cloudy with a 50 percent chance of Thunderstorms. Lows in the lower 70s. South Winds 5 to 15 Mph.

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Marietta Temperature Statistics

July Temperature

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

  • Lowest 17 July, 2025

    55.4 °F

  • Average July

    76 °F

  • Highest 3 July, 2025

    96.8 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    37.7 °F

  • Average 2020–2025

    48.2 °F

  • Average High 2020–2025

    58.6 °F
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