Steffan Reservoir Weather Forecast

    • 59
    • 74

    Rain Showers Likely

    • 59
    • 80

    Rain Showers

    • 58
    • 82

    Rain Showers Likely

    • 56
    • 83

    Chance Thunderstorms

    • 56
    • 83

    Slight Chance Thunderstorms

    • 57
    • 84

    Chance Thunderstorms

Today 29 May Knox

Showers likely. A slight chance of Thunderstorms this afternoon. Not as warm with Highs in the mid 70s. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 70 percent.

Tonight 29 May Knox

Mostly cloudy with a chance of Showers. A slight chance of Thunderstorms in the Evening, then a chance of Thunderstorms after midnight. Lows in the upper 50s. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

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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

    61 °F

  • Highest 25 May, 2026

    93 °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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