Union Grove Weather Forecast

    • 54
    • 69

    Rain Showers

    • 54
    • 75

    Partly Sunny

    • 63
    • 81

    Mostly Sunny

    • 65
    • 86

    Mostly Sunny

    • 68
    • 89

    Slight Chance Thunderstorms

    • 69
    • 88

    Slight Chance Thunderstorms

Today 4 Aug Union

Numerous Showers with isolated Thunderstorms early this Morning, then Showers and scattered Thunderstorms this afternoon. Patchy smoke. Not as warm with Highs in the lower 70s. North Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 80 percent.

Tonight 4 Aug Union

Mostly cloudy with scattered Showers in the Evening, then partly cloudy after midnight. Lows in the mid 50s. Northwest Winds around 5 Mph, becoming north after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Grove Temperature Statistics

August Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 1 August, 2026

    60.1 °F

  • Average August

    73.3 °F

  • Highest 2 August, 2026

    87.1 °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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