Steffan Reservoir Weather Forecast

    • 64
    • 80

    Rain Showers Likely

    • 60
    • 77

    Partly Sunny

    • 64
    • 81

    Rain Showers Likely

    • 60
    • 80

    Chance Thunderstorms

    • 57
    • 73

    Slight Chance Thunderstorms

    • 59
    • 74

    Slight Chance Thunderstorms

Today 15 Aug Knox

Patchy fog in the morning. Mostly cloudy with a chance of Thunderstorms. A chance of Showers in the Morning, then Showers likely in the afternoon. Humid with Highs around 80. South Winds around 5 Mph, becoming west in the afternoon. Chance of rain 70 percent.

Tonight 15 Aug Knox

Mostly cloudy. A chance of Showers and Thunderstorms in the evening. Humid with Lows in the lower 60s. Northwest Winds 5 to 10 Mph. Chance of rain 30 percent.

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Steffan Reservoir Temperature Statistics

August Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 5 August, 2026

    52 °F

  • Average August

    72.8 °F

  • Highest 11 August, 2026

    90 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (11.2 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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