Steffan Reservoir Weather Forecast

    • 33
    • 56

    Decreasing Clouds

    • 31
    • 56

    Mostly Sunny

    • 46
    • 69

    Mostly Sunny

    • 46
    • 70

    Partly Sunny

    • 43
    • 74

    Partly Sunny

    • 37
    • 63

    Slight Chance Thunderstorms

    • 36
    • 59

    Partly Sunny

Today 30 Apr Knox

Partly sunny with a chance of Sprinkles. Near steady temperature in the lower 50s. North Winds 10 to 15 Mph.

Tonight 30 Apr Knox

Partly cloudy with a chance of Sprinkles in the Evening, then mostly clear after midnight. Widespread frost after midnight. Lows in the lower 30s. Northwest Winds 5 to 10 Mph.

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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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