Union Grove Weather Forecast

    • 41
    • 62

    Increasing Clouds

    • 44
    • 65

    Rain Showers Likely

    • 44
    • 61

    Rain Showers

    • 47
    • 71

    Partly Sunny

    • 53
    • 82

    Slight Chance Thunderstorms

    • 57
    • 86

    Partly Sunny

Today 20 May Union

Mostly sunny in the Morning, then becoming mostly cloudy. Patchy frost in the morning. Highs in the lower 60s. Southeast Winds 5 to 10 Mph.

Tonight 20 May Union

Mostly clear. Patchy frost. Lows in the mid 30s. East Winds around 5 Mph.

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Union Grove Temperature Statistics

May Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 6 May, 2026

    30 °F

  • Average May

    59.3 °F

  • Highest 15 May, 2026

    88 °F

Climate (2021–Present)

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

    61.9 °F
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