Union Grove Weather Forecast

    • 59
    • 61

    Rain Showers

    • 59
    • 66

    Rain Showers Likely

    • 59
    • 71

    Mostly Cloudy

    • 59
    • 70

    Rain Showers Likely

    • 55
    • 67

    Chance Rain Showers

    • 54
    • 66

    Chance Rain Showers

Today 25 Sep Union

Cloudy with a 50 percent chance of Showers. Patchy fog. Near steady temperature around 60. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 25 Sep Union

Showers likely with a slight chance of Thunderstorms in the Evening, then Showers with a chance of Thunderstorms after midnight. Near steady temperature around 60. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Grove Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 13 September, 2026

    48.9 °F

  • Average September

    69.3 °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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