Union Weather Forecast

    • 63
    • 84

    Thunderstorms

    • 64
    • 85

    Chance Thunderstorms

    • 66
    • 87

    Chance Rain Showers

    • 66
    • 86

    Rain Showers Likely

    • 66
    • 85

    Rain Showers Likely

    • 69
    • 90

    Slight Chance Thunderstorms

    • 72
    • 95

    Mostly Sunny

Today 4 Jun Hardin

Showers likely with a chance of Thunderstorms. Near steady temperature in the upper 70s. Southwest Winds 10 to 15 Mph. Chance of rain 70 percent.

Tonight 4 Jun Hardin

Thunderstorms likely. Showers early this Evening, then a chance of Showers. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the mid 60s. South Winds 5 to 10 Mph. Chance of rain near 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Temperature Statistics

June Temperature

Marshalltown, Marshalltown Municipal Airport (11.8 miles)

  • Lowest 2 June, 2026

    54 °F

  • Average June

    70.8 °F

  • Highest 1 June, 2026

    84.7 °F

Climate (2021–Present)

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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