Steffan Reservoir Weather Forecast

    • 47
    • 74

    Chance Rain Showers

    • 48
    • 71

    Chance Rain Showers

    • 53
    • 83

    Partly Sunny

    • 31
    • 68

    Chance Rain/Snow

    • 29
    • 48

    Breezy

    • 38
    • 59

    Mostly Sunny

Today 14 Apr Knox

Mostly cloudy this Morning, then becoming mostly sunny. Not as warm with Highs in the mid 70s. North Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 14 Apr Knox

Mostly cloudy with a 40 percent chance of Showers. Lows in the upper 40s. Northeast Winds 10 to 15 Mph.

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  • 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

    43.9 °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

    61.7 °F
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