Steffan Reservoir Weather Forecast

    • 52
    • 78

    Chance Rain Showers

    • 57
    • 82

    Rain Showers

    • 54
    • 72

    Rain Showers Likely

    • 55
    • 76

    Chance Rain Showers

    • 54
    • 78

    Chance Rain Showers

    • 54
    • 79

    Chance Thunderstorms

Today 19 Jun Knox

Mostly cloudy with a 40 percent chance of Showers. Highs in the upper 70s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 19 Jun Knox

Partly cloudy. Lows in the lower 50s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

June Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 16 June, 2026

    52 °F

  • Average June

    72.7 °F

  • Highest 9 June, 2026

    95 °F

Climate (2021–2026)

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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