Steffan Reservoir Weather Forecast

    • 47
    • 78

    Decreasing Clouds

    • 56
    • 84

    Mostly Sunny

    • 61
    • 88

    Chance Rain Showers

    • 41
    • 79

    Slight Chance Rain Showers

    • 36
    • 61

    Partly Sunny

    • 34
    • 55

    Mostly Cloudy

Today 20 Apr Knox

Sunny. Much warmer with Highs around 80. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 20 Apr Knox

Mostly cloudy in the Evening, then clearing. Not as cool with Lows in the mid 40s. South Winds 10 to 15 Mph with Gusts up to 25 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

    47.1 °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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