South Yankton Weather Forecast

    • 39
    • 54

    Rain Showers Likely

    • 34
    • 59

    Partly Sunny

    • 42
    • 64

    Mostly Cloudy

    • 44
    • 65

    Rain Showers Likely

    • 45
    • 66

    Rain Showers Likely

    • 50
    • 74

    Partly Sunny

    • 56
    • 85

    Partly Sunny

Today 18 May Cedar

Showers likely with a chance of Thunderstorms. Much cooler. Near steady temperature in the lower 50s. North Winds around 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 18 May Cedar

Cloudy. Showers likely with a slight chance of Thunderstorms in the evening. Breezy with Lows in the upper 30s. Northwest Winds 15 to 25 Mph with Gusts up to 35 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Yankton Temperature Statistics

May Temperature

Yankton, Chan Gurney Municipal Airport (4.3 miles)

  • Lowest 6 May, 2026

    30 °F

  • Average May

    59 °F

  • Highest 15 May, 2026

    88 °F

Climate (2021–Present)

Yankton, Chan Gurney Municipal Airport (4.3 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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