Marietta Weather Forecast

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    Rain Showers

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    Rain Showers

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    Rain Showers

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    Rain Showers Likely

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    Rain Showers Likely

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    Chance Rain Showers

Today 14 Sep Marshall

Showers likely with a slight chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Highs in the mid 70s. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 70 percent.

Tonight 14 Sep Marshall

Showers with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Locally heavy rainfall possible. More humid with Lows in the mid 60s. South Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming southwest 10 to 15 Mph after midnight. Chance of rain 90 percent.

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Marietta Temperature Statistics

September Temperature

Marshalltown, Marshalltown Municipal Airport (4.3 miles)

  • Lowest 12 September, 2026

    55 °F

  • Average September

    76.2 °F

  • Highest 2 September, 2026

    93.7 °F

Climate (2021–2026)

Marshalltown, Marshalltown Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    39.8 °F

  • Average 2021–2026

    50.6 °F

  • Average High 2021–2026

    61.4 °F
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