Union Weather Forecast

    • 51
    • 67

    Chance Thunderstorms

    • 44
    • 66

    Chance Thunderstorms

    • 40
    • 63

    Chance Rain Showers

    • 44
    • 67

    Mostly Sunny

    • 47
    • 73

    Mostly Sunny

    • 50
    • 74

    Mostly Sunny

    • 55
    • 77

    Partly Sunny

Today 30 Apr Hardin

Partly sunny late this Morning, then mostly cloudy with a chance of Showers this afternoon. Near steady temperature in the lower 60s. Southeast Winds 10 to 15 Mph. Chance of rain 30 percent.

Tonight 30 Apr Hardin

Cloudy with a 40 percent chance of Showers. Lows around 50. Southeast Winds 10 to 15 Mph, becoming east around 5 Mph.

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Union Temperature Statistics

April Temperature

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

  • Lowest 8 April, 2025

    17.9 °F

  • Average April

    49.7 °F

  • Highest 28 April, 2025

    77 °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

    49.9 °F

  • Average High 2020–2025

    60.5 °F
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