Union Grove Weather Forecast

    • 60
    • 70

    Mostly Cloudy

    • 61
    • 67

    Rain Showers

    • 57
    • 68

    Rain Showers

    • 46
    • 62

    Slight Chance Rain Showers

    • 48
    • 61

    Mostly Sunny

    • 50
    • 62

    Partly Sunny

Today 28 Sep Union

Mostly cloudy in the Morning, then becoming partly sunny. A slight chance of very light drizzle in the morning. Patchy fog in the morning. A chance of Sprinkles. Highs around 70. Southeast Winds 10 to 15 Mph.

Tonight 28 Sep Union

Mostly cloudy. A slight chance of Showers after midnight. Lows in the lower 60s. South Winds 10 to 15 Mph. Chance of rain 20 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

    68.4 °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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