Union Grove Weather Forecast

    • 68
    • 90

    Slight Chance Thunderstorms

    • 66
    • 88

    Chance Thunderstorms

    • 69
    • 89

    Rain Showers Likely

    • 71
    • 91

    Slight Chance Thunderstorms

    • 73
    • 91

    Slight Chance Thunderstorms

    • 71
    • 90

    Slight Chance Thunderstorms

    • 70
    • 89

    Chance Rain Showers

Today 31 Aug Union

Sunny. Highs around 90. Northwest Winds around 5 Mph.

Tonight 31 Aug Union

Mostly clear this Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows in the upper 60s. South Winds around 5 Mph, becoming southeast after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Grove Temperature Statistics

August Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 5 August, 2026

    52 °F

  • Average August

    73 °F

  • Highest 29 August, 2026

    93 °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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