Union Grove Weather Forecast

    • 61
    • 75

    Rain Showers Likely

    • 58
    • 77

    Chance Thunderstorms

    • 57
    • 71

    Chance Thunderstorms

    • 60
    • 77

    Partly Sunny

    • 59
    • 81

    Slight Chance Thunderstorms

    • 53
    • 81

    Mostly Sunny

Today 17 Sep Union

Showers likely. Thunderstorms likely early this Morning, then a chance of Thunderstorms this afternoon. Not as warm with Highs in the mid 70s. Northeast Winds 5 to 10 Mph, becoming southeast this afternoon. Chance of rain 70 percent.

Tonight 17 Sep Union

Showers likely with a chance of Thunderstorms. Humid with Lows in the lower 60s. Southeast Winds 5 to 10 Mph. Chance of rain 60 percent.

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Union Grove Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 7 September, 2025

    41 °F

  • Average September

    66.4 °F

  • Highest 13 September, 2025

    88 °F

Climate (2020–Present)

Yankton, Chan Gurney Municipal Airport (30.4 miles)

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  • Average Low 2020–2025

    39.1 °F

  • Average 2020–2025

    50 °F

  • Average High 2020–2025

    61.2 °F
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