Union Grove Weather Forecast

    • 35
    • 50

    Mostly Cloudy

    • 34
    • 41

    Mostly Cloudy

    • 38
    • 49

    Mostly Cloudy

    • 15
    • 55

    Partly Sunny

    • 5
    • 21

    Mostly Sunny

    • 13
    • 22

    Mostly Sunny

Today 24 Dec Union

Mostly cloudy this Morning, then becoming mostly sunny. Patchy fog. Highs in the upper 40s. South Winds 5 to 10 Mph.

Tonight 24 Dec Union

Mostly cloudy with patchy very light drizzle. Patchy fog. Lows in the mid 30s. Northeast Winds 5 to 10 Mph.

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Union Grove Temperature Statistics

December Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 14 December, 2025

    -13 °F

  • Average December

    25.1 °F

  • Highest 16 December, 2025

    54 °F

Climate (2020–Present)

Yankton, Chan Gurney Municipal Airport (30.4 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    61.4 °F
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