Steffan Reservoir Weather Forecast

    • 66
    • 85

    Chance Thunderstorms

    • 64
    • 88

    Mostly Sunny

    • 64
    • 89

    Mostly Sunny

    • 66
    • 91

    Slight Chance Rain Showers

    • 68
    • 91

    Slight Chance Thunderstorms

    • 67
    • 92

    Rain Showers Likely

    • 66
    • 90

    Slight Chance Thunderstorms

Today 3 Jul Knox

Sunny. Near steady temperature in the lower 80s. Southeast Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 3 Jul Knox

Partly cloudy in the Evening, then becoming mostly cloudy. Humid with Lows in the mid 60s. East Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming south after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

July Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 1 July, 2026

    66 °F

  • Average July

    76.3 °F

  • Highest 1 July, 2026

    86 °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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