Union Grove Weather Forecast

    • 60
    • 89

    Becoming Sunny

    • 57
    • 82

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 65
    • 83

    Chance Thunderstorms

    • 68
    • 86

    Slight Chance Thunderstorms

    • 65
    • 86

    Chance Rain Showers

    • 61
    • 84

    Partly Sunny

Today 25 Aug Union

Sunny. Highs in the upper 80s. West Winds 5 to 10 Mph.

Tonight 25 Aug Union

Mostly clear. Lows around 60. Northwest Winds 5 to 10 Mph.

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Union Grove Temperature Statistics

August Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 5 August, 2026

    52 °F

  • Average August

    72.8 °F

  • Highest 11 August, 2026

    90 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (30.4 miles)

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  • Average Low 2021–2026

    39.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.8 °F
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