Union Weather Forecast

    • 66
    • 80

    Chance Thunderstorms

    • 64
    • 81

    Slight Chance Thunderstorms

    • 61
    • 84

    Mostly Sunny

    • 62
    • 81

    Mostly Sunny

    • 67
    • 83

    Mostly Sunny

    • 70
    • 87

    Slight Chance Thunderstorms

Today 10 Aug Hardin

Mostly cloudy with a chance of Showers and Thunderstorms. Some Thunderstorms may produce heavy rainfall. Highs around 80. Northwest Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 10 Aug Hardin

Mostly cloudy. A slight chance of Showers and Thunderstorms in the evening. Some Thunderstorms may produce heavy rainfall in the evening. Humid with Lows in the mid 60s. West Winds around 5 Mph. Chance of rain 20 percent.

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Union Temperature Statistics

August Temperature

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

  • Lowest 1 August, 2025

    54.6 °F

  • Average August

    70.1 °F

  • Highest 8 August, 2025

    88 °F

Climate (2020–Present)

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

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  • Average Low 2020–2025

    39.3 °F

  • Average 2020–2025

    50 °F

  • Average High 2020–2025

    60.7 °F
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