Union Grove Weather Forecast

    • 62
    • 85

    Chance Thunderstorms

    • 64
    • 85

    Mostly Sunny

    • 60
    • 84

    Chance Thunderstorms

    • 56
    • 76

    Chance Thunderstorms

    • 54
    • 74

    Slight Chance Thunderstorms

    • 52
    • 74

    Partly Sunny

Today 14 Sep Union

Partly sunny. A chance of Showers with a slight chance of Thunderstorms in the afternoon. Humid with Highs in the mid 80s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 30 percent.

Tonight 14 Sep Union

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy with a slight chance of Showers and Thunderstorms after midnight. Humid with Lows in the lower 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Grove Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (30.4 miles)

  • Lowest 7 September, 2025

    41 °F

  • Average September

    63.5 °F

  • Highest 11 September, 2025

    84 °F

Climate (2020–Present)

Yankton, Chan Gurney Municipal Airport (30.4 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    50 °F

  • Average High 2020–2025

    61.2 °F
Get WillyWeather+ to remove ads