Steffan Reservoir Weather Forecast

    • 51
    • 86

    Slight Chance Rain Showers

    • 53
    • 88

    Mostly Sunny

    • 54
    • 83

    Rain Showers Likely

    • 53
    • 82

    Rain Showers

    • 44
    • 73

    Chance Rain Showers

    • 40
    • 63

    Mostly Cloudy

    • 46
    • 68

    Partly Sunny

Today 14 May Knox

Partly sunny. Patchy blowing dust. Windy with Highs in the upper 80s. Southwest Winds 20 to 30 Mph with Gusts up to 45 Mph.

Tonight 14 May Knox

Partly cloudy in the Evening, then clearing. Lows in the lower 50s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

May Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 6 May, 2026

    30 °F

  • Average May

    55.8 °F

  • Highest 11 May, 2026

    86 °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

    61.8 °F
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