South Yankton Weather Forecast

    • 63
    • 86

    Mostly Sunny

    • 62
    • 86

    Chance Thunderstorms

    • 61
    • 83

    Slight Chance Thunderstorms

    • 63
    • 79

    Chance Rain Showers

    • 64
    • 83

    Slight Chance Thunderstorms

    • 64
    • 85

    Slight Chance Thunderstorms

Today 20 Aug Cedar

Sunny. A slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 20 Aug Cedar

Mostly clear. Near steady temperature in the lower 60s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Yankton Temperature Statistics

August Temperature

Yankton, Chan Gurney Municipal Airport (4.3 miles)

  • Lowest 5 August, 2026

    52 °F

  • Average August

    73 °F

  • Highest 11 August, 2026

    90 °F

Climate (2021–2026)

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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