Union Grove Weather Forecast

    • 59
    • 67

    Chance Rain Showers

    • 63
    • 75

    Rain Showers

    • 62
    • 81

    Chance Rain Showers

    • 58
    • 70

    Mostly Cloudy

    • 54
    • 68

    Slight Chance Rain Showers

    • 52
    • 67

    Mostly Cloudy

Today 16 Sep Union

Mostly sunny in the Morning, then mostly cloudy with a slight chance of Showers in the afternoon. Highs in the upper 60s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 16 Sep Union

Cloudy. A chance of Showers in the Evening, then a slight chance of Showers and Thunderstorms after midnight. More humid. Near steady temperature in the mid 60s. Southeast Winds 5 to 10 Mph. Chance of rain 30 percent.

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Union Grove Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 13 September, 2026

    48.9 °F

  • Average September

    73.9 °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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