Union Grove Weather Forecast

    • 50
    • 60

    Cloudy

    • 53
    • 65

    Rain Showers

    • 54
    • 66

    Chance Rain Showers

    • 57
    • 67

    Rain Showers Likely

    • 58
    • 70

    Slight Chance Thunderstorms

    • 57
    • 74

    Chance Drizzle

Today 22 Sep Union

Mostly cloudy. A slight chance of very light drizzle in the morning. Patchy fog in the morning. Highs around 60. East Winds 5 to 10 Mph.

Tonight 22 Sep Union

Mostly cloudy. Lows in the lower 50s. Southeast Winds 5 to 10 Mph.

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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

    71.1 °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

    50.5 °F

  • Average High 2021–2026

    61.8 °F
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