Steffan Reservoir Weather Forecast

    • 36
    • 41

    Gradual Clearing

    • 32
    • 62

    Partly Sunny

    • 31
    • 52

    Chance Rain Showers

    • 41
    • 57

    Rain Showers Likely

    • 55
    • 66

    Rain Showers Likely

    • 51
    • 76

    Rain Showers Likely

Today 7 Apr Knox

Cloudy. A slight chance of snow Showers this Morning, then a slight chance of rain Showers this afternoon. Highs in the lower 40s. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation 20 percent.

Tonight 7 Apr Knox

Mostly cloudy. A slight chance of rain Showers after midnight. Breezy and not as cool with Lows in the mid 30s. Temperature rising into the mid 40s after midnight. Southeast Winds 15 to 25 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

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Steffan Reservoir Temperature Statistics

April Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 1 April, 2026

    30.9 °F

  • Average April

    37 °F

  • Highest 4 April, 2026

    45 °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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