Union Weather Forecast

    • 57
    • 79

    Becoming Sunny

    • 55
    • 75

    Mostly Sunny

    • 59
    • 78

    Slight Chance Rain Showers

    • 60
    • 78

    Partly Sunny

    • 67
    • 86

    Mostly Sunny

    • 70
    • 94

    Slight Chance Thunderstorms

Today 21 Jul Hardin

Mostly sunny. Highs around 80. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 21 Jul Hardin

Mostly clear. Lows in the upper 50s. North Winds 10 to 15 Mph.

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Union Temperature Statistics

July Temperature

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

  • Lowest 13 July, 2026

    61.6 °F

  • Average July

    77.3 °F

  • Highest 2 July, 2026

    91.7 °F

Climate (2021–2026)

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

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  • Average Low 2021–2026

    39.7 °F

  • Average 2021–2026

    50.6 °F

  • Average High 2021–2026

    61.4 °F
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