Steffan Reservoir Weather Forecast

    • 61
    • 90

    Mostly Sunny

    • 68
    • 95

    Mostly Sunny

    • 66
    • 92

    Chance Thunderstorms

    • 65
    • 92

    Chance Thunderstorms

    • 72
    • 96

    Partly Sunny

    • 73
    • 103

    Slight Chance Thunderstorms

Today 5 Jun Knox

Mostly sunny. A slight chance of Showers and Thunderstorms early. Highs in the upper 80s. East Winds around 5 Mph, becoming north. Chance of rain 20 percent.

Tonight 5 Jun Knox

Mostly clear. Lows in the lower 60s. Northeast Winds 5 to 10 Mph, becoming southeast after midnight.

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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 1 June, 2026

    60.1 °F

  • Average June

    72.9 °F

  • Highest 3 June, 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

    61.9 °F
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