Union Grove Weather Forecast

    • 69
    • 79

    Thunderstorms Likely

    • 69
    • 88

    Rain Showers Likely

    • 61
    • 86

    Chance Rain Showers

    • 55
    • 79

    Mostly Sunny

    • 61
    • 82

    Chance Thunderstorms

    • 60
    • 86

    Mostly Sunny

    • 56
    • 80

    Chance Rain Showers

Today 6 Sep Union

Showers and Thunderstorms likely. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the lower 80s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

Tonight 6 Sep Union

Mostly cloudy with a chance of Showers. A chance of Thunderstorms, mainly this evening. Some Thunderstorms may produce heavy rainfall this evening. Locally heavy rainfall possible. Lows in the upper 60s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 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 2 September, 2026

    66.9 °F

  • Average September

    79.9 °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

    39.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.8 °F
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