Steffan Reservoir Weather Forecast

    • 69
    • 85

    Mostly Cloudy

    • 68
    • 90

    Slight Chance Thunderstorms

    • 67
    • 88

    Chance Thunderstorms

    • 66
    • 84

    Chance Thunderstorms

    • 62
    • 79

    Chance Thunderstorms

    • 61
    • 75

    Chance Rain Showers

Today 8 Aug Knox

Mostly sunny. A slight chance of Showers in the morning. Highs in the upper 80s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 8 Aug Knox

Mostly cloudy. Humid with Lows in the upper 60s. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

August Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 5 August, 2026

    52 °F

  • Average August

    70.5 °F

  • Highest 3 August, 2026

    89.1 °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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