Union Weather Forecast

    • 32
    • 50

    Mostly Sunny

    • 28
    • 53

    Mostly Sunny

    • 49
    • 63

    Mostly Sunny

    • 47
    • 76

    Mostly Sunny

    • 57
    • 78

    Partly Sunny

Today 18 Apr Hardin

Mostly sunny and breezy. Much cooler with Highs around 50. Northwest Winds 15 to 25 Mph.

Tonight 18 Apr Hardin

Mostly clear. Lows in the lower 30s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming west 5 to 10 Mph after midnight.

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Union Temperature Statistics

April Temperature

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

  • Lowest 7 April, 2026

    27.6 °F

  • Average April

    49.8 °F

  • Highest 14 April, 2026

    84.7 °F

Climate (2021–Present)

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

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  • Average Low 2021–2026

    39.6 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.2 °F
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