Steffan Reservoir Weather Forecast

    • 28
    • 51

    Breezy

    • 30
    • 53

    Mostly Sunny

    • 36
    • 62

    Mostly Sunny

    • 50
    • 76

    Mostly Sunny

    • 53
    • 81

    Mostly Sunny

    • 59
    • 85

    Chance Rain Showers

Today 17 Apr Knox

Mostly cloudy this Morning, then becoming partly sunny. Windy and much cooler with Highs around 50. Northwest Winds 20 to 30 Mph with Gusts up to 45 Mph.

Tonight 17 Apr Knox

Mostly cloudy in the Evening, then clearing. Windy and much Colder with Lows in the upper 20s. Northwest Winds 20 to 30 Mph with Gusts up to 40 Mph, Diminishing to 15 to 20 Mph with Gusts up to 30 Mph after midnight.

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Steffan Reservoir Temperature Statistics

April Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 10 April, 2026

    23 °F

  • Average April

    46.2 °F

  • Highest 12 April, 2026

    84 °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

    50.4 °F

  • Average High 2021–2026

    61.8 °F
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