Union Grove Weather Forecast

    • 71
    • 92

    Mostly Sunny

    • 71
    • 94

    Mostly Sunny

    • 71
    • 94

    Slight Chance Thunderstorms

    • 71
    • 90

    Chance Thunderstorms

    • 73
    • 90

    Chance Thunderstorms

    • 66
    • 89

    Slight Chance Thunderstorms

    • 63
    • 87

    Slight Chance Thunderstorms

Today 3 Sep Union

Sunny. Near steady temperature in the lower 90s. South Winds 10 to 15 Mph. Heat index Values up to 104.

Tonight 3 Sep Union

Mostly clear. Lows in the lower 70s. South Winds 5 to 10 Mph. Heat index Values in the upper 90s early this evening.

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  • Temperature Real-Time

Union Grove Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 1 September, 2026

    68 °F

  • Average September

    76.9 °F

  • Highest 1 September, 2026

    90 °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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