Steffan Reservoir Weather Forecast

    • 64
    • 90

    Slight Chance Thunderstorms

    • 68
    • 93

    Mostly Sunny

    • 68
    • 95

    Mostly Sunny

    • 69
    • 96

    Mostly Sunny

    • 70
    • 97

    Hot

    • 72
    • 98

    Hot

    • 73
    • 98

    Hot

Today 10 Jul Knox

Mostly cloudy. Near steady temperature in the mid 80s. South Winds 5 to 10 Mph.

Tonight 10 Jul Knox

Mostly cloudy in the Evening, then clearing. Lows in the mid 60s. South Winds 5 to 10 Mph.

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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 3 July, 2026

    64.9 °F

  • Average July

    77.9 °F

  • Highest 2 July, 2026

    91 °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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