Steffan Reservoir Weather Forecast

    • 60
    • 88

    Rain Showers Likely

    • 40
    • 78

    Chance Rain Showers

    • 38
    • 62

    Chance Rain Showers

    • 44
    • 63

    Rain Showers Likely

    • 42
    • 60

    Rain Showers

    • 36
    • 55

    Chance Rain Showers

    • 36
    • 57

    Partly Sunny

Today 22 Apr Knox

Sunny, windy with Highs in the upper 80s. South Winds 20 to 30 Mph with Gusts up to 40 Mph.

Tonight 22 Apr Knox

Mostly cloudy. Showers likely with a chance of Thunderstorms after midnight. Windy with Lows in the upper 50s. South Winds 20 to 30 Mph with Gusts up to 45 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

April Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 10 April, 2026

    23 °F

  • Average April

    47 °F

  • Highest 16 April, 2026

    87.1 °F

Climate (2021–Present)

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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