Union Grove Weather Forecast

    • 75
    • 96

    Chance Rain Showers

    • 72
    • 94

    Patchy Smoke

    • 69
    • 90

    Partly Sunny

    • 71
    • 92

    Chance Thunderstorms

    • 68
    • 85

    Chance Rain Showers

    • 66
    • 83

    Mostly Sunny

Today 26 Jul Union

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms this Morning, then mostly sunny this afternoon. Hot with Highs in the mid 90s. South Winds 10 to 15 Mph. Chance of rain 20 percent. Heat index Values up to 113 this afternoon.

Tonight 26 Jul Union

Partly cloudy. A slight chance of Showers and Thunderstorms in the evening. Humid with Lows in the mid 70s. South Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight. Chance of rain 20 percent. Heat index Values up to 111 early in the evening.

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Union Grove Temperature Statistics

July Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 22 July, 2026

    59 °F

  • Average July

    77.9 °F

  • Highest 17 July, 2026

    97 °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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