Union Grove Weather Forecast

    • 56
    • 71

    Rain Showers

    • 55
    • 79

    Rain Showers

    • 52
    • 71

    Mostly Cloudy

    • 57
    • 66

    Chance Rain Showers

    • 54
    • 69

    Chance Rain Showers

    • 54
    • 70

    Chance Rain Showers

Today 13 Sep Union

Mostly cloudy with a 40 percent chance of Showers. Highs in the lower 70s. East Winds 5 to 10 Mph.

Tonight 13 Sep Union

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the mid 50s. Southeast Winds 5 to 10 Mph, increasing to 15 to 20 Mph after midnight. Chance of rain 50 percent.

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Union Grove Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 10 September, 2026

    54 °F

  • Average September

    76.1 °F

  • Highest 4 September, 2026

    95 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (30.4 miles)

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  • Average Low 2021–2026

    39.4 °F

  • Average 2021–2026

    50.6 °F

  • Average High 2021–2026

    61.8 °F
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